Yes, virtually all students keep one or more tabs permanently opened to social networking services like Facebook.
But that doesn’t mean they want everything to be social. Students associate Facebook and similar sites with private discussions, not with corporate marketing. When students want to learn about a company, university, government agency, or non-profit organization they turn to search engines to find that organization’s official website. They don’t look for the organization’s Facebook page.
"College Students on the Web and their use of Social Networking websites.
This is particularly interesting, because as a web-developer I see many older companies trying to reach a younger audience, and they believe the key to that world is Social Networking. But Social Networking offers pretty much nothing in terms of usefulness to this age group.
(Source: useit.com)