Somebody should build a service for this.

My wife and I recently moved and, while we ended up somewhere we like, there was one particular street right next to our old house that we always wished we would be able to get a home on. When we talked to other neighbors that were thinking about moving, we found out that we were far from the only ones eyeing that street. Unfortunately, people there rarely sold and, when they did, the homes got snapped up quick.

We thought about sending letters to see if somebody wanted to sell to us without going the realtor route, but we never did. Facebook ads would have made it way easier. And a service where we forked over $50 to run some ads plus $250 as a reward and pushed a button would have been better still.