HoverMe, a new browser add-on, is launching to add contextual social information about who you follow on the new version of Twitter. After you install the add-on, which works with Firefox, Chrome, and IE, when you hold your mouse or cursor over someone’s name on Twitter.com, it brings up a window that shows links to that person’s profiles on other social networks and media sites.

For example, If I hover over my colleague Alexia Tsotsis’ name in my Twitter stream, I’ll be able togo straight to her Facebook, Foursquare, PlanCast, and FriendFeed accounts via the hovercard. HoverMe pulls in all this information via an API from Qwerly which pulls any profiles that can be found publicly in a Google or Bing search, including LinkedIn, Flickr and more.

It’s actually incredibly useful to quickly find contextual social information about Twitter users. Unfortunately, it only works in Twitter and exclusively in the new web application that Twitter rolled out a few months ago. But Hoverme’s developer Aculis, says that they are hoping to add a similar functionality to Facebook.com