Depends — how big are your pockets?
A ‘smartphone’ is essentially a pocket-sized supercomputer*, with several types of transponder — including one for cellular networks. AFAIK, the social media sites work as well (or better) on desktops. It’s a tradeoff between mobility and screen size.
* For ‘fun’, compare the specs of a new smartphone with a 1970’s era Cray supercomputer.
I do not “do” social networks, and I prefer a computer I can do work on, not a social messaging toy.