Examples LinkedIn 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
If you’re looking to establish a professional relationship with someone, consider LinkedIn. LinkedIn is still seen as the more professional of the two. Considering the above example, I pose a question on Facebook etiquette: Is it appropriate to let these requests sit in pending mode or to reject the friends outright??
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