Can you explain the loss of quality or demise of other social networking sites?

I’m not even sure how many other sites closed down or lost significant numbers of members to fluther. Please identify the other site, and, if you can, explain what happened to make the website go out of business. If the other website still exists, please identify the site, and explain what happened to make you move here. Finally, how does fluther differ in terms of culture or feeling from the other social networking site(s) you are most familiar with? We all know moderation is different, but what is the impact of that moderation?

I will answer this question, telling my own story, later on in the discussion.