Communication is a deeper problem than email. It's not something you will single-handedly solve, but there is a lot of room to do good work in this area. "I wa

Communication is a deeper problem than email. It's not something you will single-handedly solve, but there is a lot of room to do good work in this area. "I want to be that social network" - if that's your sole strategy, you're screwed. You need to start smaller than that. Build a tool which lets users do more for less effort and it will be easy for them to adopt. Worry about penetration from there.