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Some ads are by agency / agent / pimps, some are real independents. Google phone number and if you see it in some other site with different photos you know it's at least agency, possibly scam as...

You could try keksik.net or naberu.com.

First of all, thank you for good tips everyone posting here, I've been reading forum for year without registering. Figured I post my experiences from Kiev if these help someone else, lets start with...