What kind of website should I start?

So I’m looking at great and fast growing, innovative, modern websites like Fluther for example and see how fast the web is developing.
I own a website, and I get around 2.000 page views daily. But the topic is very specific, and not many people are interested in its content.

So I am asking you what kind of a website or a web service would you like to visit? Or, what do you recommend is a good, innovative, wanted website topic or service I should start?

Any ideas or tips on launching a wanted website are welcomed and highly appreciated!