Cool idea. Here are a few ideas:<p>1. I second what eykanal said. That wide button looks kind of weird and I didn't see it right away.<p>2. I would rewrite the text for the Ask, Reply, and Follow sections from the perspective of a power user. Imagine that you are simply a user of the site, you love it, and you are giving your friend an elevator pitch of why they should use it, too. As it is, you are just explaining the actual functions of the service, but you are not conveying the value proposition. After reading each little section, a prospective user should think "Oh, nice, that solves a problem that I have." To add another layer to this, be compelling and tell a story. You could even use a use-case example. For instance:<p>- Ask people which food truck is best in Midtown, NYC
- Let people know about that amazing slice of pizza in Brooklyn
- Keep track of activity in the East Village<p>3. The stream seems really wide. Maybe you can have two columns: one for questions and one for answers. Then they would be thinner, easier on the eyes, and it would showcase what your service does a little better.<p>Hope this helps!