Ideas which are out of scope currently
Label tagging
rather than just friend tagging
Face recognition
use face.com api – perhaps once it gets a big enough sample dataset it could even suggest sites where you may have photos that you don’t know about? maybe this is impossible… I don’t know…
Video tagging
Perhaps just simply tagging “You are somewhere in this video” or perhaps something more complex?
Text tagging
In the same way you can link to users with @Jonathan Scott for example on Facebook or @jscott1989 on twitter, perhaps blog owners would like the ability to @ tag their social networking contacts. This would have the difficult of what is shown to users who don’t have the plugin/javascript injected. Perhaps something like “@Jonathan Scott[http://facebook.com/jscott1989]” which gets shortened into a link by the plugin. Also it must be thought about what is able to be tagged (Facebook friends, twitter, facebook pages, other blogs? etc…) and is it not easier just to insert a link if that is needed…