This is interesting because I thought that Durov after selling VK invested the proceeds into FB?! I don't know that the decline of usage of Facebook means Face

This is interesting because I thought that Durov after selling VK invested the proceeds into FB?! I don't know that the decline of usage of Facebook means Facebook is necessarily in decline (though I agree with the anecdotal notes about using FB less). It could be that usage has moderated a bit from the migration from desktop to mostly mobile. It may mean that social network activity is split say between FB and Snapchat (and messaging clients). If it does indicate FB is in decline, it doesn't necessarily mean social networks are unneeded or in decline, it may just mean we need new social networks :-).