I feel you, but you may be helping Facebook by leaving your profile alive. I’d guess that vertices in their social graph hold value, regardless of the content present. The more vertices, the more ads served, the more revenue Facebook brings in.

Perhaps, but IIRC, they're tracking "monthly active users" (which dropped for the first time in North America, recently). So my inactive profile still counts against them in at least some of their metrics.

Despite what they say, I really doubt the ever truly delete the vertices after a profile-deletion, since they create vertices for people who have never even signed up (shadow profiles) from address book info they've slurped up.

Plus, I'm pretty pragmatic about this, and need to balance anti-social-network activist with personal inconvenience. My inactive profile's banners remind people that they need to contact me specially if they want to invite me to something, and the banner also increases the perception that people are leaving Facebook. Ultimately it's that perception that will start a snowball effect that will finally do it in.