Talking about "Facebook suicide" was all the rage about a year ago, but it misses what I suspect is an even larger trend, "Facebook atrophy". That is what happens to millions (if not tens of millions) of Facebook users who are the long tail. Most of us only log into Facebook when someone wants to be our friend, which is often (thankfully!) about once or twice a month, cause about five pageviews, then get on with our life. I'm sure we are listed as "active users" in their advertising portfolio, but we are barely worth counting. We probably don't even have much of a positive network effect.
This hit me in the face yesterday when I did one of my rare logins and noticed that my list of friends includes someone who died over a year ago. Yes, he is still my friend in that I think of him often and appreciate him, but things like this makes me less inclined to believe in Facebook's numbers.