I tried so search from web some tools or websites, which could prove my point, but there wasn't any. Almost got the impression that this is information Facebook is not sharing with us. Or then they just don't store old status updates.
Also I haven't received any new FB friend invites for some time and also the amount of others making friends are calming down. Could it be that now in FB usage has calmed down. Most of those who will join have joined and rest won't join due to principle.
I'm not saying that FB is in any ways dying, but maybe the dynamics of usage are changing. I would say there's bit more interaction, meaning more comments on posts and then there's much more links shared than previously and discussion is going around those.
Maybe this is specific to Finland or then this is just my imagination, but let's see, if this is one ff these silent signs on social media usage changing. If my guess on this usage pattern is correct, next step could be Twitter having easier way to follow up tweets related to specific links somehow. Kind of like comments on blogs or comments on FB or Buzz updates.
I'll keep on following if this is really a trend.