* Is there a sticky explaining the differences of airdrops vs bounties vs signature campaigns?
Airdrop is used as a promotional tool such as social media or video. While the Bounty campaign project depends on the amount of hard cap.
* Do they favor my status (Jr Member I think I am) ... I know that higher statuses earn more at this point
Yes for jr. of course they support him to participate
* Can you participate in more than one?
my experience to join Bounty. I participated in more than one Bounty project. even if you can follow all Bounties, you can follow them
* If you post here everyday as a habit, what's the level of extra effort involved in participating in bounties and signature campaigns?
If you post every day here it's better. Means that you are actively working as a member of the Bounty