Quick copy comment:
I don't understand what this means on the frontpage:
"We find the keywords distinct to who you follow"
On the feed page, "Why am I seeing this?" shows this:
"How keytweet works: When you click like or retweet. We try display tweets with similar content. If you don't rate or retweet. We build a list of popular topics in your feed. We then try to match tweets from your feed to those topics. The # on the left side is how relevent we feel that tweet is to you. Enjoy!"
It's confusing.
So my advice is for you to have somebody review all your copy.
edit: my comment might sound very dry, so let me add this: I think it's a good idea if done well, though I follow a small enough number of people that I might not need it yet.