I've found this: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5610684/

Facebook use after acute social stress impair recovery of cortisol levels. I translate it as "Facebook use after social altercation makes stress longer".

Thanks for idea!

Well, if the studies are anything like FDA approve pharmaceuticals, the studies will be funded by twitter, no raw data will be made available, no attempts to replicate the studies by 3rd parties will even be allowed, much less made, and the FDA will approve the results.