With the rise of social media sites like Facebook, Twitter, and LinkedIn comes a rise in a market designed to “teach” companies how to leverage social media sites for business purposes. Are these sites really valuable for companies?

Ask Dan McDonald about millennials—those elusive 12- to 26-year-olds raised among text messages and Twitter—and he'll chuckle emphatically. "They're the perfect customers,"

It's understandable that the MySpace folks would feel a little slighted by all the attention Facebook has been getting.