You're missing the issue I'm referring to. Staying in touch with you is very different when the communication mechanism doesn't pose extra hurdles and burdens compared to the majority of your cohort. It's also very different when you're already close friends by the time you part ways. The issue here is that some people will have social media and some will lack it, putting the latter at an artificial and entirely avoidable disadvantage, causing them to make fewer of those close friendships in the first place compared to their peers. This disparity is the issue I'm talking about, when the bonds aren't strong enough yet.