I'm a expert in PPC via adwords and have been using it for years to send targeted traffic to my IM Blog and offers but have never used the POF - Plenty of Fish advertising platform.
I've heard mix response from it, some saying it's dying out others saying you just need to optimize your campaign a bit more these days....
What's your experience with POF? Would you recommend advertising IM offers of some sort on them?
... All input WELCOME! :-)