headup

Headup is a Semantic Web Firefox addon enables you to browse by topics and not by links. Headup finds for you cool & important information about your friends & interests and helps cut down your search time.
Connect Headup to the online services you are subscribed to and see how your social circle is related to your tastes & interests.
Play the music & videos you discover in Headup's overlay without interfering with you're browsing. The overlay interface also keeps Headup's discoveries in context with your current browser tab so that you don't lose track of what interests you.
Headup is activated in any of the following methods: Highlighting text, right-clicking and selecting the "Headup this option". Hovering over words Headup has identified and underlined on the pages you browse. Googling and selecting the Headup results offered.