As my Facebook cohort aged up into their mid-20s, my feed is all baby photos and overchurned memes that have been re-shared across 5 different sites, interspersed with relentless posts from artists I forgot I liked long ago, and ads that are trying hard to be local. Its utility is increasingly not defined by the Feed, but by being a contact list of Everyone You Ever Met Who You Don't Want To Unfriend, which has some uses for communication, warding off the most superficial kind of loneliness, and when someone is giving away spare goods a la Craigslist.
Most of the visually enticing bragging has moved onto Instagram, where the content is front-and-center and all about the number of hearts, imitating the style of celebrity influencers: beach scene with brand cocktail, friends taking a multi-selfie at an event, etc.
Conversely, my Snapchat is full of relatively mundane stuff: morning selfies with makeup on point, silly antics at a party, funny faces and filters.
To me, Instagram is actually the most frustrating, as it's the one that amplifies discrepancies between the popularity of your friends the most. For those of your real life friends who attract a lot of likes, it makes you feel like an increasingly irrelevant fan of a rising celebrity; while those who get very little validation are attract solely the sympathy heart, and often get deleted at the end of the day, leaving both the poster and you dissatisfied.
For these reasons, Instagram is a bad fit for people who are self-conscious about their relative lack of popularity, which is -- let's face it -- quite a few people. On the other hand, it's a great fit for people who, for whatever reason, can get plenty of likes from strangers and friends alike: no wonder it's the favored platform for social media influencers and their sponsors.