I do that often. It's not healthy. No one can be happy all the time, and it's healthy to be okay with just feeling neutral, but it would probably feel a lot better to do other things than to just have one interest, things online. There are lots of things to do online, chatting, games, but if you're asking this question, you probably don't feel satisfied with it, or else it wouldn't make much sense to be concerned. I feel more satisfied when I can meet up with friends or feel motivated to go outside to take a walk, because variety is rewarding.