Sure. I *try* to limit my HN/Wikipedia/etc usage because it's interesting but it gets me very distracted from my goals. For example, my monkey brain hears a song and I suddenly
need to get the lyrics, the story behind it, etc. The monkey brain is very creative at finding ways to avoid doing difficult tasks.
Reddit and Twitter are mostly a waste of time nowadays due to the signal to noise ratio. I dropped my reddit addiction and I'm working on eliminating Twitter.
I wish there were a social network system where people pool and share what they are expected to be doing and help each other. Or at least encourage each other to focus. But this goes against the advertisement paradigm where they want us to be impulsive and stupid. Sad, sad, sad.