Even as this video makes its rounds, the mighty Facebook too is quickly losing it's lustre. Facebook usage declined 10% in April! Read this article: "...Facebook is Screwed"
Although I know several people that have done it themselves, I'm not quite ready to commit "Facebook Suicide" yet. But as it becomes more and more spammy, and I use it less and less, I can see the day coming as that trend is gaining some momentum.
