This is something that fascinates me as it's a real thing that has caused whole part of the web to suffer, revenues to suffer too for some site admins, beyond more typical events that lead to the demise of a forum. There appears to be a pattern, that the main social media type platforms, once they got to ta critiacal mass, sucked up so much internet traffic combined with google algo's to sweep all new traffic to their platforms, giving many a sense that this was the internet, to use an analogy it reminds me of the affects first seen in the US and then across the world, as young people matured to younger adult status, they fell out of favour with the local town square full of Mon & Pop stores, lured by the Mega mall down the track, leaving future generations with no experience of the old town square, depriving it of footfall/traffic and thus sealing it's fate to fall into derelictions and so on. 2012 IMHO looks like a topping point in traffic terms, when the social media platforms and Googles algo'saligned to create a massive tractor beam to pull in traffic. Lastly, the Mega Malls are now in disrepair across the US, might we see the same with the social media giants in the short to medium term? Fb has fallen out of favour but the damage sadly IMHO has been done. So what do admins think or what have you observed, similar or not, across forums of the net?