Review my startup idea: Re-thinking the inbox

I was talking with my dad about his work when he started complaining about the volume of email he gets. After looking through his email, I started thinking about how people use email and where it fits in the workplace. I'm a fan of GTD, so my concept is a tool that handles your email, tweets, Facebook posts, and Google+ shares as next actions in the GTD system.

Down the road, I'd like to offer a developer API, because there could be uses for this tool beyond what I would imagine. I'd also like to offer four versions of this app, hosted for personal use, hosted for businesses, via AWS marketplace, and a deployable version for business who want to host in-house.

What do you guys think? I'm always open to comments and suggestions. Thank you for your time and consideration.