PT - and other forums - often slow down in summer time, as folks are outdoors more. Winters, it gets dark early, more time to be online.

I don't think social networks have caused a slow down on forums - even my FB news feed has slowed down for the summer!

And, when I see someone on FB posting about an issue, I refer them to the forum for in depth discussion, support and so on. (Mostly this is bichon stuff, lol).