Recently, I noticed that Instagram has tweaked their algorithm so that likes (and story views) are doled out in a more spread out fashion. If you post something, you won't get a bunch of likes at once, now, you're more likely to get them over the course of 24-48 hours to get you back checking the app over the entire window. I figure they have always done this, but the window seems to have grown substantially. It seems like they are reaching further and further to get engagement.
Will FB be able to infinitely increase their engagement, or will they run out, and be left with a bunch of zombie addicts who are no longer valuable to them, since they've effectively killed their host? It seems like drugs sometimes have this end game.
Personally, I'm moving away from using any more unpaid platforms to host my data or work. If a platform has a free option, I choose to pay for it. I no longer trust companies that rely solely on advertising revenue (err, maybe that means I shouldn't be using HN :) )