I would say and I know from experience, to be careful not to place ads on certain forums. Some forums welcome ads and others do not. In my case I looked at all the fine print first and if they did not allow certain ads (or other wise known to some as spam)I would leave it alone. Some on the other hand would happily accept ads. Then the others say they accept ads, but end up turning around and blocking your ads.
Also become very familiar with Key Codes and Hit Tracking. When placing ads this will be your new best friend. This will tell you exactly what works and what doesn't.
I would say and I know from experience, to be careful not to place ads on certain forums. Some forums welcome ads and others do not. In my case I looked at all the fine print first and if they did not allow certain ads (or other wise known to some as spam)I would leave it alone. Some on the other hand would happily accept ads. Then the others say they accept ads, but end up turning around and blocking your ads.