My step-son is also in a band, and says whenever they do a show it's packed since he set up a Facebook page for it!
He's really big into computer things through his work, and says this is the new way of advertising. He had some term for it, which I can't remember. lol!!!! And you'll notice all the different quilt shops, etc, etc, on there that you can become a 'fan' of now.
:-)