I'm not sure if cryptotalk is owned by yobit. Cause their campaign on yobit has ended and based on the post of yobit, they will start again another set of campaign but they mentioned that cryptotalk will handle it this time. Meaning, they are segregate entity compared to yobit exchange.
@OP, lots of users here in forum have joined their campaign that's why most wear it. I think this campaign has the most number of participants in bitcointalk forum that pay btc.