Are you being serious right now? Don't bother to use that exchange site since a lot of scam accusation threads has been opened up and yet here you are wanting to try just because there's a lot of ads? Don't be ridiculous perhaps don't dare.

Anyway, some those who have Yobit signatures were been temporary banned by Theymos.
Furthermore, you can read some discussions here or perhaps want to search on your own.
• YoBit Signature Campaign (Bitcointalk)
• Yobit spam on the forum