I would also argue that it's because of this new social-networking craze that makes it even less important to be on a label. The DIY ethic is a helluva lot easier in 2012 than it was 20 years ago when you HAD to rely on labels, flyering, and getting reviews or interviews in printed 'zines. People are now in control of and have all the tools they need right at their fingertips to do all of their own marketing and promotion.
That said, any band in 2012 should still have their own website, first and foremost. Don't put all of your eggs in just one basket (i.e., Facebook or MySpace). Buy a domain name for your band and set up a blog there. Then connect it with your social networking sites... Facebook, Twitter, Bandcamp, LastFm, Hideout page, etc. I didn't list MySpace because I don't even waste my time on that crappy site anymore. Then instead of linking to your Facebook page and being overly worried or concerned that you don't have enough "Likes" on it or whatever, just link to your band's personal website. The important thing is that you have all the goods there that booking agents will need in order to book your band, such as music (a no-brainer), videos, a bio, etc. I would personally NEVER send any label or promoter a link to my band's Facebook page. Let them find that on their own AFTER they visit your site.