Microblogging Ping.fm Social Networking Social News 
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
Social News (Digg, Sphinn, Mixx, Reddit, Tip’d, and a whole load of related sites) Submitting only your own articles and posts to social media sites. Social news is about reciprocal relationships. Submitting a story to a social news site that is completely off-topic. Excess converts to spam.
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