I've been (personally) using Twitter more frequently lately because more people I know are using it.
Not sure how many people really care where I'm having dinner. But, I figure there are many more people interested in startups. So, I've kicked off a Twitter account for OnStartups.
If you are interested in getting pithy insights, quick tips and short quips On Startups on Twitter, follow OnStartups on Twitter:
I'll try to keep the signal-to-noise ratio high (and post only things that are at least semi-useful and/or related to startups).