People who have "quit" a social network or website in the past, what was your reason for doing it? And what would make you want to go back?

I joined Facebook many years for about 6 hours before I pulled the plug. I didn't realize that they pulled all of my email contacts and asked to friend them on Facebook. Every one of my business contacts and customers received an email from me. THAT was embarrassing. I have no desire to return.

I used to belong to a chess forum but inadequate moderation allowed the trolls to run the show. There were times they carried on like small children. Chess is supposed to appeal to brighter people, but that's not always the case and it certainly wasn't evident there.

I pulled out of Askaholics because the site was dominated by three snarky born-agains who turned every topic into an evangelistic opportunity. That was bad enough but their continuous, mutual high-fiving was a bit much. They are allowed to post anything they want without censure.

I appreciated the moderation on Ask which was very good (in spite of the complaints by some who felt fettered) and was a little concerned about the moderation on Blurtit. Yet you've achieved a perfect balance -- moderation with a light touch and everything rolls along so smoothly. Congratulations to you, Rooster and Angela.

Myspace- wasn't as popular as facebook and i hated everything about the site. (Myspace was already dead when i tried it in 2007)

BuddyTV- A site redesign caused a mass exodus in late 2008 (things were never the same after that)

Amirite- A replacement for Sodahead... Stayed there a month and left because the UI is cluttered and i just didn't like it even though it was the closest thing to Sodahead. Plus, all of the former sodahead cult members from Phaet moved in)

Ask.com - they were too strict and the Admins kept pissing me off lol.. 

Fluther- The site was too complicated to use.. The UI is terrible

Xsodaheads.com - The ui was old and i hated the features.

(i never went back to any of these sites)

A few years ago, I had quit using Facebook for like a couple of months. It was getting on my nerves, despite me never getting notifications from anyone. The reason why I got a Facebook again? Because at the time it was the only way to communicate with long distance family members.