Whoisi is a social media tracker like Friendfeed but with a clever twist. While Friendfeed and similar apps require a user to upload all of their RSS feeds and accounts, Whoisi takes a wiki-based approach allowing anyone to update the accounts of anyone else. In a way, it's like the Imaginary Friends function in Friendfeed but taken to the next level.
Whoisi allows you to add all the various feeds for any person(s). For example, my Whoisi record includes my feeds from twitter, friendfeed, flickr, my Content Matters blog, my LinkedIn profile and even my recently played music tracks from Last.fm.
As Blizzard points out in his description of Whoisi, most social media sites are organized around accounts rather than people. Whoisi flips that model and allows you to track people. And, with a wiki-based model, those people records can be updated by the person themselves or by others who track them. In essence, you can add people like you might add RSS feeds to a reader, while leveraging the effort of the crowd to get more of that information updated.
Whoisi does not require a user ID - just visit the page and start to add. However, it's cookie-based, so if you want to use it on multiple PCs, be sure to click the Login Later button in the upper right, which will give you a URL to return to your profile. While the site does not have login information, it does use IP info to track changes to each listing.
Of course, there's an open API. While the API documentation does not yet exist, there's an API call that allows you to extract the entire database.
Whoisi is largely an experiment right now, or as Blizzard describes it, an evening hack. Playing around with it, I find it a pretty useful tool, thought I'm not sure that it will become my primary feed for friend info. If you want to get a sense of how Whoisi can be used today and where it could be headed, spend a few minutes reading through the comments on Blizzard's blog post. The open source community is all about sharing and lots of interesting ideas are posted in the comments.
If you want to know what I'm up to, you can follow me on whoisi at http://whoisi.com/p/1658 (all whoisi URLs use a TinyURL form).
Another neat utility I've been playing with is Retaggr. Retaggr is sort of the flip side of whoisi, answering the question "what are all your social media accounts?". Retagger allows you to enter all of your social media accounts then creates various badges to display them.
My full retaggr profile is shown below.
At some point, there will be an open social graph and it will be much easier to find friends and colleagues and to help them find you. In the meantime, tools like Whoisi and Retaggr help to bridge that gap.