David Weinberger posted a comment about Tagging like it was 2002, which quotes Matt Mower discussing the state of tagging. I mostly agree, but not completely. In the consumer space thing have been stagnant for a while, but in the enterprise space there is some good forward movement and some innovation taking place. But, let me break down a bit of what has gone on in the consumer space.
History of Tagging
The history of tagging in the consumer space is a much deeper and older topic than most have thought. One of the first consumer products to include tagging or annotations was the Lotus Magellan product, which appeared in 1988 and allowed annotations of documents and objects on one's hard drive to ease finding and refinding the them (it was a full text search which was remarkably fast for its day). By the mid-90s Compuserve had tagging for objects uploaded into its forum libraries. In 2001 Bitzi allowed tagging of any media what had a URL.
The down side of this tagging was the it did not capture identity and assuming every person uses words (tag terms) in the same manner is a quick trip to the tag dump where tags are not fully useful. In 2003 Joshua Schacter showed the way with del.icio.us that not only allowed identity, upon which we can disambiguate, but it also had a set object in common with all those identities tagging it. The common object being annotated allows for a beginning point to discern similarity of identityĵs tag terms. Part of this has been driven on Joshua's focus on the person consuming the content and allowing a means for that consumer to get back to their information and objects of interest. (It is around this concept that folksonomy was coined to separate it from the content publisher tagging and non-identity related tagging.) This picked up on the tagging for one's self that was in Lotus Magellan and brings it forward to the web.
Valuable Tagging
It was in del.icio.us that we saw tagging that really did not work well in the past begin to become valuable as the clarity in tag terms that was missing in most all other tagging systems was corrected for in the use of a common object being tagged and the identity of the tagger. This set the foundation for some great things to happen, but have great things happened?
Tagging Future Promise
Del.icio.us set many of out minds a flutter with insight into the dreams of the capability of tagging having a good foothold with proper structure under them. A brilliant next step was made by RawSugar (now gone) to use this structure to make ease of disambiguating the tag terms (by appleseed did you mean: Johnny Appleseed, appleseeds for gardening/farming, the appleseed in the fruit apple, or appleseed the anime movie?). RawSugar was a wee bit before its time as it is a tool that is needed after there tagging (particularly folksonomy related tagging systems) start scaling. It is a tool that many in enterprise are beginning to seek to help find clarity and greater value in their internal tagging systems they built 12 to 18 months ago or longer. Unfortunately, the venture capitalists did not have the vision that the creators of RawSugar did nor the patience needed for the market to catch-up to the need in a more mature market and they pulled the plug on the development of RawSugar to put the technology to use for another purpose (ironically as the market they needed was just easing into maturity).
The del.icio.us movement drove blog tags, laid out by Technorati. This mirrored the previous methods of publisher tagging, which is most often better served from set categories that usually are derived from a taxonomy or simple set (small or large) of controlled vocabulary terms. Part of the problem inherent in publisher tags and categories is that they are difficult to use outside of their own domain (however wide their domain is intended - a specific site or cross-sites of a publisher). Using tags from one blog to another blog has problems for the same reason that Bitzi and all other publisher tags have and had problems, they are missing identity of the tagger AND a clear common object being tagged. Publisher tags can work well as categories for aggregating similar content within a site or set of commonly published sites where a tag definition has been set (but that really makes them set categories) and used consistently. Using Technorati tag search most often surfaces this problem quickly with many variation of tag use surfacing or tag terms being used to attract traffic for non-related content (Technorati's keyword search is less problematic as it relies on the terms being used in context in the content - unfortunately the two searches have been tied together making search really messy at the moment). There is need for an improved tool that could take the blog tags and marry them to the linked items in the content (if that is what is being talked about - discerning predicate in blog tags is not clear yet).
Current Tools that Advanced
As of a year ago there were more than 140 social bookmarking tools in the consumer space, but there was little advancement. But, there are a few services that have innovated and brought new and valuable features to market in tagging. As mentioned recently Ma.gnolia has done a really good job of taking the next steps with social interaction in social bookmarking. Clipmarks pioneered the sub-page tagging and annotation in the consumer tagging space and has a really valuable resource in that tool. ConnectBeam is doing some really good things in the enterprise space, mostly taking the next couple steps that Yahoo MyWeb2 should have taken and pairing it with enterprise search. Sadly, del.icio.us (according to comments in their discussion board) is under a slow rebuilding of the underlying framework (but many complaints from enterprise companies I have worked with and spoken indepth with complain del.icio.us continually blocks their access and they prefer not to use the service and are finding current solutions and options to be better for them).
A Long Way to Go
While there are examples that tagging services have moved forward, there is so much more room to advance and improve. As people's own collection of tagged pages and objects have grown the tools are needed to better refind them. This will require time search and time related viewing/scanning of items. The ability to use co-occurance of tag terms (what other tags were used on the object), with useful interfaces to view and scan the possibilities.
Portability and interoperability is extremely important for both the individual person and enterprise to aggregate, migrate, and search across their collections across services and devices (now that devices have tagging and have had for some time, as in Mac OS X Tiger and now Vista). Enterprises should also have the ability to move external tagged items in through their firewall and publish out as needed, mostly on an employee level. There is also desire to have B2B tagging with customers tagging items purchased so the invoicing can be in the customers terminology rather than the seller terminology.
One of the advances in personal tagging portability and interoperability can easily be seen when we tag on one device and move the object to a second device or service (parts of this are not quite available yet). Some people will take a photo on their mobile phone and add quick tags like "sset" and others to a photo of a sunset. They send that photo to a service or move it to their desktop (or laptop) and import the photo and the tag goes along with it. The application sees the "sset" and knows the photo was transfered from that person's mobile device and knows it is their short code for "sunset" and expands the tag to sunset accordingly. The person then adds some color attribute tags to the photo and moves the photo to their photo sharing service of choice with the tags appended.
The current tools and services need tools and functionality to heal some of the messiness. This includes stemming to align versions of the same word (e.g. tag, tags, tagging, bookmark, bookmarking). Tag with disambiguation in mind by offering co-occurrence options (e.g. appleseed and anime or johnny or gardening or apple). String matching to identify facets for time and date, names (from your address book), products, secret tag terms (to have them blocked from sharing), etc. (similar to Stikkit and GMail).
Monitoring Tools
Enterprise is what the next development steps really need to take off (these needs also apply to the power knowledge worker as well). The monitoring tools for tags from others and around objects (URLs) really need to fleshed out and come to market. The tag monitoring tools need to become granular based on identity and co-occurance so to more tightly filter content. The ability to monitor a URL and how it is tagged across various services is a really strong need (there are kludgy and manual means of doing this today) particularly for simple and efficient tools (respecting the tagging service processing and privacy).
Analysis Tools
Enterprise and power knowledge workers also are in need of some solid analysis tools. These tools should be able to identify others in a service that have similar interests and vocabulary, this helps to surface people that should be collaborating. It should also look at shifts in terminology and vocabulary so to identify terms to be added to a taxonomy, but also provide an easy step for adding current emergent terms to related older tagged items. Identify system use patterns.
Just the Tip
We are still at the tip of the usefulness of tagging and the tools really need to make some big leaps. The demands are there in the enterprise marketplace, some in the enterprise are aware of them and many more a getting to there everyday as the find the value real and ability to improve the worklife and workflow for their knowledge workers is great.
The people using the tools, including enterprise need to grasp what is possible beyond that is offered and start asking for it. We are back to where we were in 2003 when del.icio.us arrived on the scene, we need new and improved tools that understand what we need and provide usable tools for those solutions. We are developing tag islands and silos that desperately need interoperability and portability to get real value out of these stranded tag silos around or digital life.