This is very cool. A way for me to filter by activity type would be helpful.
Re traffic, it is the lifeblood of any site. Couple thoughts:
- Buy banner or link on site(s) that attract the type of users you want. - Submit to bloggers who'd find this cool. - See if there's anyway you can create original content out of this and seo that. Thinking out loud here, perhaps snapshots of what happened in different areas per day, and then seo those pages. But that'll take time to start building traffic.