Just a warning. Be careful of this site on facebook https://www.facebook.com/yobitexchanger/ . I though it was the official page so I reported my deposit issue to them. They replied:

Unfortunately, this is a general error with our exchange , and after we checked we found that your transaction TXID has not been verified yet on our network for unknown reasons
to fix this problems you have to refresh your transaction network by new deposit of 0.1 BTC and all your stuck amounts of any coin will be released
when you are ready ask us for the deposit that you will use so our system link the general address by your account and after the deposit received our verification system will track it and fix the error with your account
Sincerely
Support Team

Then they sent me a BTC address. I doubt any exchange will ever ask you to send more money to correct a deposit and especially not 0.1 BTC. So this is definitely a BIG SCAM. BEWARE !!!!!!!