Time to disengage from Facebook?

There's plenty of evidence that Facebook is more than willing to sell its customers out:

• Facebook's "Evil Interfaces"
• The Evolution of Privacy on Facebook

...and ongoing security holes and exploits are a further cause for concern:

• Facebook leaks IP addresses
  
• Rogue Marketers Can Mine Your Info on Facebook
  
• Rogue Facebook apps steal log-in data, send spam
  

I hardly even bother signing in any more. I've been thinking of just closing my account.