Who's the best flat-top barber in San Francisco?

I'm from NY. Will my iPhone incur roaming charges in Bermuda?

What kind of wine goes with tofu parmesan?

Twitter is a Q&A machine. Here's how you get in on the action: ask a question. People like to help, and Twitter lets them do so by offering just a sentence or two. So although you won't always get answers, a lot of the time you will (even if you have just a handful of followers). Twitterers are delighted to contribute their knowledge.

If you want a more formal process, or if you'd like to reach beyond your own followers, consider TweetBrain (http://tweetbrain.com), a Twitter-powered Q&A service.