They both captured the early market (inconsistent page style of Myspace, slowness of Friendster, then they acquired Friendfeed) in an early internet - anyone who captures the early market will have THE network effect for decades (plus shadow profiles) as person x joins because person y is there because person z is there - which is still young to this day, and also they apparently used to censor links to their competition

The game is rigged, also Instagram and Whatsapp (yeah, companies get acquired. but WA's Acton was very explicit - "delete Facebook" (also, ever tried deleting FB? almost impossible. more network effects). he was pissed off at what happened)

... the other theory of Facebook's decline is that Eternal September gets you every time. I mean in the 1970s the CBGB and Mudd Club were really cool and they folded up and the scene moved on.

Once I started using the social features on my MQ3 I found it really was Zuck's worst nightmare. I met all these nice retirees who were fun to play Beat Saber with and who would go on cruises and post YouTube links to pano videos they take of the ship.