I know lots of people who feel they get and have got tremendous practical benefit from Facebook. It isn't "addictive" unless you use that term to mean anything some people make that other people enjoy.
https://www.ncbi.nlm.nih.gov/pubmed/28093386
"Our results showed that overall, the use of Facebook was negatively associated with well-being."
Naturally, even if this study is accurate it isn't definitive; the causation could go in the other direction, that the unhappy use Facebook more often than the contented. But it's still quite suggestive.
I saw this study referenced from this article: https://www.vox.com/policy-and-politics/2018/3/21/17144748/c...