This is a classic "quitting an addiction" post. I've seen and heard this many times, from people playing wow to smokers to coffee drinkers. If you have to announce how and why you are quitting, then you probably are doing it too much.
http://www.newsweek.com/id/183180 here's a newsweek "I'm quitting FB" article and I'm certain I've seen one on slate.com Is Facebook really so all consuming for these people who have to quit it publicly? Personally I love FB. It's like auto-pilot for my social life. It reminds me about the birthdays about the people I only vaguely care about, leave them a one-line message on their wall and that's it until next year.…
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What's not to like?
Dude, I think you answered your own question: superficial relationships masquerading as genuine ones - you know, that does bother some people.