The only thing that ever really sucked me in like that was Tumblr. The stigma-less repost culture where most of what you encounter is reposted made it feel like I was
building something by being on there and reposting things. It really just tickled the right part of my brain. My wife and I would spend literal hours every night scrolling Tumblr.
I've never really gotten anything near that level of enjoyment from another social network.
I still go on from time to time but knowing my friends are never going to see my feed kind of discourages major time investment.