Instagram,Tik-Tok, Discord,Youtube, X (Twitter) and Tumblr.
Almost all of them, except Tumblr, I use too much. I usually go through the loop of deleting then redownloading due to FOMO. I don't have friends except IRL ones on Discord. There is no particular reason why I use the applications other than boredom beyond measure.
I would indulge in my hobbies, however, training my attention span to get used to more quiet, focused moments rather than constant-scrolling and self-indulgent content that's being pushed to me feels far too difficult. I'm slowly trying to make the move to forums though.