There are only two reason why people go online; to either solve a problem or to entertain themselves, nothing else.
Think about it, you never just “waste time”, you’re solving a news, banking, work, vehicle, or home related problem or you’re entertaining yourself. Gossip sites, games, the news, all forms of entertainment. Twitter can be both, entertaining and solving a problem. Reddit, YouTube, Facebook, are mostly entertaining but can solve problem for us. E-mail newsletters for the most part don’t solve a problem, neither do they entertain, hence why average open rate for e-mail newsletters is dismally low.