Where do you go to report a ufo sighting?

I saw this really cool ufo about a month ago and I want to get the word out. Did some browsing online and found a few sites, probably the coolest one was chasingufos.com..., but it doesn't have a lot of members yet. Other ones sound like the government is behind them. Do they actually investigate your sighting and give you feedback on their findings? It'd be nice to know if anyone else saw the same ufo.