spectwitter 

One who uses Twitter to read other people's Tweets but does not post anything. Equivalent to a lurker in Facebook, MySpace, and other forums.

Hey, I haven't seen you on Twitter lately.

Yeah, I'm more of a Spectwitter these days.

spectwitter by shankweather August 27, 2009

non seqtwitter 

Facebook status messages and twitters that completely lack any context.

Bob just updated his facebook status to "fish baskets". what total non seqtwitter.

non seqtwitter by John Olmstead July 8, 2009