Track Mashup Submit Mashup Mashup: Headup Comments deprecated Semantics, Semantics, Plugins, Plugins, Social Headup is a Semantic Web Firefox addon that brings you content related to your interests, friends and contacts. Summary Comments (1) Followers (3) Changelog (1) Summary Comments Followers Changelog Comments (1) Comment * Leave this field blank Post Comment assaf_hal 3:09 AM Apr. 01 2009 reply I see Headup as a 'super-mashup' - In regular mashups I expect to get a cross-reference between 2 sites; here, it's like getting a smart mix of many sites. When I'm in Twitter and open Headup on someone I get things about him from Facebook, Delicious, Last.fm and Friendfeed - all in the same window. Powerful!