You can’t waste time. You only do what you choose to do because it is the best available option you have at the time. Unless you’re a masochist and you choose to do things you don’t like, and that will never give you a pay back.
Calling something a time waster is kind of a way to get others to give you a break for not being productive all the time. Productive, that is, according to social standards. Social standards can go fuck themselves, as far as I’m concerned. As long as you aren’t hurting someone, you should do what you think is good for you to do.
In the US, we have this workaholic culture that says you must work all the time. Well, a lot of us have discovered we like playing, and that we can live just fine playing a lot and working a little. As long as you don’t hurt anyone, and as long as you aren’t placing a burden on anyone else, you aren’t wasting time at all.