Never used twitter, but I was a reddit addict. My life is much better now that I've stopped. It really is the only winning move.
The good news is that it reduced my Youtube time as well because I didn't have anything to pair it with. I realized I would watch Youtube and if I was bored or uninterested I may pull out my phone and hop on Reddit. Get bored of Reddit? Find a video to throw on. It was good to put a wrench in this self-reinforcing feedback loop.