"A trend I have noticed among my friends is the decreasing number of status updates posted to Facebook. Just six months ago my news feed would have been filled with the daily dribblings of my friends. Now there are less than a handful of status updates in my newsfeed, often from the same 5 people."
I wonder if this was an algorithmic change by Facebook in their "Top News" section. I noticed an extremely sharp decline in the number of new stories I see when I log in, starting a couple of months ago. There's plenty in "Most Recent," however, so it's just getting filtered out.
For me personally, it's made Facebook seem much less interesting and decreased my usage. I'm sure they're watching the numbers, though...