Adding to this: TikTok, Shorts and Reels have complete new threat model that begun emerging in 2010’. There is highly likelihood that he will get addicted the first time he touches it.
Things that changed significantly in the last 10 years:
AI slop - he will need to learn how to spot fake stuff.
Social Media Algorithms - how to train them to watch stuff you want to watch and not to fall into toxic rabbit hole
Taxis ware replaced by uber and other gig stuff.
I am not aware of any such feature on Lemmy Look into https://dokie.li/ or WordPress with ActivityPub plugin and LaTeX plugin