My friendly and knowledgeable colleague Charlie Schick in a podcast interview by Geek Army Knife.
Charlie "(…) spoke about lifestreaming and how it led [him] to thinking about semantics. [He] mentioned a bunch of folks along the way, including Friendfeed, Socialthing, Socialbrain [or Second|Brain?], Lovely Systems, and TagCrowd. (…)"
(Via Charlie Schick)