It's sad that you can sit in front of the internet and not think of anything to search for. StumbleUpon and many others have brought back 'the excitement of randomness' and now TweetDeck brings you their own directory.
"Sometimes it’s hard to find people talking about things you’re interested in on Twitter. So we’ve created the TweetDeck Directory to make it easier to find and follow your favourite subjects, a bit like a TV Guide for Twitter channels."
Oh, and if you consider yourself a 'social media professional' and your not using TweetDeck, you should be hit in the head with a hammer. A really good hammer.