I recently deactivated Facebook (which I only ever used via web browser) and since then I’ve been counting the number of times I unconsciously end up on the Facebook login page when I’m bored/killing time. I’ve noticed that faced with a “new tab” I’ll often just hit the f key and hit enter without thinking about it, landing me on the Facebook login page. Before I deactivated, this would result in me somewhat unconsciously scrolling through my newsfeed mindlessly consuming whatever Facebook decides I should see that day. I don’t consider myself to be mentally weak so it scares me to think about what percentage of the population does this without ever realizing it.
Oh I totally do this with Hacker News too, which is why I typically block access during work hours. I feel better about it if I'm consciously giving myself a break to read HN. Right now I'm using the LeechBlock Extension which allows for timed overrides.
I use SelfControl to block these websites on my mac. I use uBlock filters to block feeds on my phone. I also log out of some websites when I'm done. It helps a lot.
