Communities Groups Microblogging Ping.fm 
Techipedia: Tamar Weinberg
JUNE 30, 2008
The only similarity is a 140 character limit for posts — so Plurk is essentially a microblogging platform. Plurk: Real Nested Conversations Brought to the Microblogging Platform A few days ago, I noticed via Twitter search tool Summize that Aaron Brazell had been talking about me on his Twitter stream.
Techipedia: Tamar Weinberg
DECEMBER 10, 2008
Abusing group invites. And if they don’t accept, don’t send the group request more than once by asking them to join via email, wall post, or Facebook message. In a specific case, I manage a few LinkedIn groups so my email address is far more visible on the site than I’d like. Many call this spam.
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