Buffalo, Amherst, Clarence, NY Real Estate and Other Stuff...

I recently saw on of MY listings posted on Craigslist through another Real Estate Company.  It is listed in the MLS, but can they do that?

I live in Clarence Center, New York.  It is a suburb of Buffalo, NY.  What I like about living here is that it feels like a small town, but drive 5 minutes away, and you can get anything you want. One cool thing about Clarence Center is the bike path.  It used to be railroad tracks.  They call it...