I'm now on Twitter.
I've tweeted for a few months for my employer, but not on a personal account. I think that for the content that I'm running these days -- short, entertaining posts -- Twitter should work well.
There's a utility that allows a blogger to feed his/her content directly into a Twitter account, and I think that I've installed it properly. This might drive a bit more traffic to my blog, and therefore increase my meager ad revenues.