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.
I participated in the cryptotalk campaign and the payment is made to my yobit account, so that alone could tell that its' own by yobit.
They are building that forum so they can market the coins listed in their exchange I believe.