I suggest that it isn’t so much that social media CHANGED anything, as that having it be so public, OPENLY ILLUSTRATED IT ALL.
By the way, the reason why a smart divorce lawyer will tell you to lay off social media until the proceedings are complete, isn’t because they think that social media magically causes things to happen. It’s because they want you to provide your opposition as little chance to interfere with your goals as possible. That’s why it DOES matter in some cases, but DOESN’T matter in others.
People navigate in different circles that have different expected codes of conduct (not just related to social class or geography : you tend to associate with people with whom you share values and habbits, and then tend to assume that the norm in your little group is the general norm), and I’m not convinced that your experience is more representative than mine (where people would have exactly zero issue with calling a married acquaintance or friend of the opposite sex).
ETA : noticing that I’m about the 457th poster making this point.
People are becoming less social now days thanks to Facebook, Instagram, twitter and texting. Before people would meat up and hang out with friends at mall, park,video arcade, diner, bar or cafe so on.
People are also starting relationships, families having kids and sex later in life than before thanks to Facebook, Instagram, twitter and texting.
Not only do I see no evidence for that, I don’t even think there could be evidence for that, yet. Most of these technologies are only a few years old. I think it’s far more likely that the long-term trends of more higher education and more women working in careers is responsible for the (slow) movement toward later marriages.
As for relationships and sex, there seems to be plenty of it going on at young ages these days, too, although in places with rational sex education pregnancies are trending later in life (and are more or less unchanged in places with “abstinence-only” or no sex ed). Remember these technologies brought us “sexting” and Tinder, too. I think it’ll be a while before their long-term effects (if any) are known.
In the US, teens are losing their virginity (self-reported) at later ages than a few decades ago. It’s self-reported, so you can’t count on absolute truth, but I’ve read several articles like this one and this one on the subject.