Surely everyone has seen this in their own experiences already? Of course, FB is mostly attractive to those that are desperate to share their lives, mostly because no one else will listen (and no ones listening on FB either...)
Ultimately, the day of the overshare may have passed, and bragging online isn't as fun as it used to be.
The really interesting questions is how FB is used and viewed outside the US/EU where a channel for personal expression is not a given.
Maybe FB starts to become focused on these societies?