Read this: Microblogging: A Semantic Web and Distributed Approach

Publication recommendation: Alexandre Passant, Tuukka Hastrup, Uldis Bojars, John Breslin: Microblogging: A Semantic Web and Distributed Approach. 4th Workshop on Scripting for the Semantic Web. June 2, 2008, Tenerife, Spain. 12 pages, download link.