Twitter versus Plurk: Not Even in the Same League
Techipedia: Tamar Weinberg
JUNE 30, 2008
On the other hand, Plurk is really new, and thus, Twitter wins on followers (and the fact that mobile access — via SMS — totally owns), so the Plurk discussions (for now) are at a minimum. I think plurk is more for networking and twitter more for tweeting news/events/links. I have also been using ping.fm
199 
Let's personalize your content