I’ve been using this quite a lot recently. It’s not a problem looking for people who are talking about an issue on Twitter, but it is a problem that Twitter is so fast moving, and the people you find today might not be there tomorrow. Likewise, it’s not a problem finding people who major on a certain issue (WeFollow, anyone?), but they might not be talking about it right now. Enter Tweefind. Type in your search terms and it gives you the people talking about that, now, ranked. As with all these tools you need to supplement it with real work, like you would supplement a MacDonalds and Special Brew with some freshly crushed orange juice and vitamin pills, but it’s a reasonable place to start.