Can anyone tell me about what is bounty campaigns?
Bounty campaigns are used to draw attention to the product. By participating in bounty campaign you can receive stakes by meeting certain conditions set by a bounty program operator. As I know, bounty programs require from you to put their signature(text which appears under each of your post on the forum), use their avatar and post at least certain times per defined period.
Thus more you post, more people see your signature, thus more get aware of the product under the campaign.
Ask more, if you still have questions