I've done a few tweets and got a few friends to do some as well yesterday. I'd say we collectively put about 100 tweets out there. Will hit em with a couple hundred more today and do a bunch of retweets too.
...stupid question though, I'm fairly new to twitter and wanted to know if a tweet to @cryptsy will be just as effective as a retweet of someone's post? Thanks
About Twitter - tweets and retweets do two different things (both good). A tweet to cryptsy will be seen by them, and everyone that follows them. A retweet will be seen by people that follow you.
There are a lot of other effective ways to use twitter, let me know if anyone wants more info.