you need to be more specific.

plurk is all about me: getting my karma score up, watching others comment on my updates, showing off my smilies and timeline upgrades...

what do you mean? hey check out my karma

twitter is about community: continuous stream of updates from friends, easier to find people to follow, mobile updates = seamless connection

just some thoughts I'm working through...

...but...but...uh...twitter doesn't have a dancing banana!!!

no dancing banana, but I completely agree with leadingzero - well,

but plurk actually motivates me to post because I get dancing bananas.

so it's the idea of getting rewarded for having conversations instead of seeing if they could happen on their own?

yes, we're all motivated by something to start a conversation. For those of us who are usually shy, dancing bananas help out a lot!