I recommend BidFox for advertising on OK. This exchange is an official partner of the social network and offers almost complete automation of processes. Full support might provide more opportunities, but it's important to choose the right public pages, as there are many in the database. I have never ignored advertising on OK, as there are many paying users here, unlike VK. However, I didn't run ads as effectively before as I do now. Among the drawbacks, I can note the double moderation, which rejects some creatives. First, the post goes through moderation within the exchange, and then in the social network itself. This leads to two problems: 1. Some creatives do not pass, even though they seem to comply with the rules, but are on the edge of what is acceptable. The return could have been 100%. 2. Moderation takes an average of about two hours, which complicates quick ad setup.
