Social network app API as a service?

I'm in the process of building a social network related app targeted for a certain niche. I'm more than three quarters of the way done and planning to release it this month. But an idea came to me that apart from this app in itself, is there a market for a social networking app as a service?

What I mean by this is that there would be an API available using which a developer can very easily create a social networking app and customize it to their specific needs. I could also offer the front-end of my app as a starter kit.

So would you or anyone you know be interested in this kind of service?