I was reading up on some RCTs on social media and mental health recently and one of the surprising findings is that social media is actually worse for older people.
* Balki et al 2022, metaanalysis, same thing: good for reinforcing existing real-human social connections, overcoming barriers to/increasing regularity and frequency of contact, acquiring access to resources; isolating to use outside that context; regular and frequent contact much more effective than occasional or episodic: https://aging.jmir.org/2022/4/e40125/
My overall impression seems to be what common sense tells us: to the extent it lets you overcome aging-related obstacles to interacting with real people, great; to the extent it’s brain rot, it’s isolating.