Assuming you actually care what your Twitter followers think about your tweets, wouldn’t it be useful to have an app that does the following?

1. Analyses your followers’ tweets and streams including the links they contain, to determine their interests and then tells you the strength of tweet you are about to post in terms of its correlation with those interests.
2. Regularly displays fresh blog posts and tweets to you that your followers might like but that the majority of them have not tweeted about yet or seen in their streams.

I know, I know it’s a bit sad and if you really need a tool to tell you what to tweet then you probably don’t deserve any followers. If you are using Twitter for marketing though, as one or two (or 10 million) people do, I imagine you could find this really useful. Besides would you really bet against this sort of app becoming popular? Oh and for revenue, the app could use a combination of a freemium and ad-based model. A free ad-supported model that analyses only half your followers for example and a paid full version. Come to think of it, perhaps Twitter itself should build this tool.