I had also joined Twitter in order to resume contact with an old radio friend. Once that contact was made, I let the account go dormant. Recently, some skanky-slutty-disreputable types started "following" me...e-mail notifications informed me.
So I deleted Twitter, too. When you're electronically 'out there', anything can attach itself to you. It's just more maintenance to try and keep your name clear.
As Facebook becomes a larger and larger beast, supportive of mega-corporations, it becomes a frightening threat looming on the horizon. I encourage anyone who doesn't really need Facebook to get out while there's still time.