Cryptotalk is a forum made by Yobit. Yes they are paying their users per post but this is not guaranteed. Most of the users there are risking their time and effort since this is a 50:50 chance of earning good amount of money. Their talk token will surely get dumped as soon as their launch it to their exchange. So there is a big possibility that a lot of users there will get only small amount of money after waiting for how many months, posting on their forum not having fixed amount of payment. For me it is just considered as a bounty, where payments are most of the time not guaranteed (most only pays very small amount if converted to fiat).