On a small scale, yes. On Twitter scale (in February they were averaging 50 million tweets/day [1]), it's probably not so simple.

[1] http://blog.twitter.com/2010/02/measuring-tweets.html

Edit: As of mid June, it was about 65 million per day.

http://blog.twitter.com/2010/06/big-goals-big-game-big-recor...