StackOverflow and "forums in the good old days" are 1- way smaller than any of Twitter/FB/etc and 2- are mostly centered on one subject: it’s quite easy to remo

StackOverflow and "forums in the good old days" are 1- way smaller than any of Twitter/FB/etc and 2- are mostly centered on one subject: it’s quite easy to remove abuse on SO because it’s about coding and anything else should be removed. On the other hand, Twitter/FB/etc have hundreds of millions of users posting all sorts of things. Moderation is a hard problem because it doesn’t scale. There are ~21M questions on StackOverflow, which is equivalent to the number of tweets posted every a single hour and the number of items shared on Facebook every 8 minutes.