i actually did some pretty extensive research on this. there's very few high-quality apps in this area. the only software i found to be genuinely effective is this very obscure program called sprintworks (windows only). dunno how it works but so far i haven't been able to figure out a way to bypass the block.

to my mind, an effective blocker is extremely important and far superior to using willpower to resist your bad side. the fact is that when gratification is impossible or really difficult, you don't need to spend any willpower at all, you can just count on your other bad side, i.e. your 'lazy' self, to kill off the social media impulse. when a little person inside you says "go check out facebook!", previously you yourself have to step in and say "no, f* off*!" but now you can just sit back and watch with quite amusement as another little person (your lazy self) steps up and say "nah man, it's too much trouble" —— and bam! the impulse is gone.

the ego depetion theory in psychology may have turned out to be less empirically well-founded than people think, but personally i found it to be very useful. avoid using willpower as much as possible. instead, cleverly design your environment and play the little bad people inside your against one another to your advantage.