This is just not true. I'm actively using social networking and local bbs's to get me + wife into the local social scene. We're both from out of town and we've moved to a place with very small tight groups of friends who have typically grown up together and are a little nervous about outsiders. It's not a good environment for walking up to people in bars and introducing yourself, but these sites allow you to start goofing around with people anonymously, which then makes them more interested and curious about you when you meet them IRL.

You're missing
10. I'm a one man IT department and have a job as long as we don't go out of business.