Parece que sim, afecta negativamente a saúde mental:
https://news.sky.com/story/social-medias-dark-side-revealed-scientists-say-facebook-addicts-are-similar-to-drug-users-11603504
Citando:
"
Scientists carrying out a gambling experiment found the worst performers tended to be those who regularly used platforms such as Facebook.
The same trend was also observed among people who are reliant on drugs such as cocaine and heroin.
"Around one-third of humans on the planet are using social media, and some of these people are displaying maladaptive, excessive use of these sites," said lead researcher Dr Dar Meshi, from Michigan State University."