You can be selective about who you send friend requests to - all, a few specifically or none.
I just clicked, yes, yes, yes and then, "fuck!" I should have been more careful but today my point was proven again via email. Facebook is dumb.
[insert name] thinks you're Hot and would like to add you to her hot friends list. Click here to add [insert name] to your Hot friends list. If the link doesn't work, try pasting http://apps.facebook.com/thehotness/ into your browser.
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This email was sent on behalf of [insert name] while using Hotness.
To learn more or to stop receiving these emails, click here.