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.
I confirmed Cryptotalk is forum, it's owned by yobit exchange. I participated in cryptotalk campaign i think still running, i got payment many times and it's provided by yobit exchange. Yobit signature campaign on ended 27th january which is launched from bitcointalk forum. Now there no bounties campaign, i think they focusing to grow huge traffic.