(STRETCH GOAL) MAP VIEW - As a user, as I zoom in and out of the map view, I'll see pins collapse and coagulate depending on my view distance. Multiple pin indicator will contain an indicator of quantity

[tophersjones]

Clicking on collapsed pins can either display a scrolling view of multiple posts, or can auto-zoom the view so you can click an individual post.

[tophersjones]

See craigslist housing listings map view for an example of this