As a millennial (25), I disagree with the notion that all of Facebook and Instagram are vapid and meaningless. To me, that just shows that you're not curating your feeds in a manner that highlights what good remains on the platforms.

The problem to me is not that people are less willing to participate, but that the platforms have consumed all meaningful discussion. I'm a part of some fantastic niche groups on Facebook, follow insightful people on Twitter, and read many fantastic subreddits. I've led book clubs, played board games, and developed deep, meaningful relationships via these platforms. They problem is they have been consumed in the monolith of likes and cat pictures, and pulling the value out is growing more difficult. It's a matter of continually chopping back the vines (cutting /r/funny and /r/worldnews out of reddit, deleting friends you don't care about and unliking fan pages on Facebook).

My internet social groups are still the same as yours are. We just have different mediums through which we communicate.