It's a slippery slope from Yelp reviews to genetically engineered super soldiers.

Social media explains the Fermi Paradox. Once it arises technical civilizations regress.

How can they not have social media in a universe where FTL communications and travel exist? Unthinkable!

Do you know how the Enterprise is this huge ship that carries a huge population, but yet very few people are seen working in each department? Yeah, the rest of them just stay in their bunks doomscrolling, subsisting on Doritos and soda from the replicator ("Diet Coke, cold"). A significant part of government provided basic housing is on starships, because it gives their working crews a sense of importance. When a ship is in range of other ships, space stations, or planets, transporter technology is used to seamlessly reallocate the population. The residents would notice if they bothered to look out their windows, but they mostly don't. It's also why the rest of the ship is so austere - the working crew knows that indulging base material desires is the fast track to becoming a bunk dweller.

Maybe they had it and wisely decided to get rid of it.

In Star Trek they don’t have television. I remember there was an episode where it is mentioned as a dead medium from the 20th century.

I’m guessing they don’t have films either.

They do have written books though.

Now the Star Trek TNG film Star Trek First Contact takes place in the 21st century and features rock and roll and characters talking in “modern” parlance.

I’m guessing that in between the 21st century and the 24th century mankind advanced and stopped watching tv and movies and went back to reading books.

Perhaps they advanced and abandoned social media as well. The Star Trek’s version of forums and the internet could be an idealized version of Hacker News where everyone actually follows the rules and Dang the AI moderator can just chill and not do much. It’s very possible.