It is very to understand. I think you should read carefully the information that already providing on the page 1 of the bounty link.
There are many campaigns such as Signature Campaign, Youtube/Blogging/Article Campaign, Twitter Campaign, Facebook Campaign, Translation Campaign, ... Example. For Twitter Campaign, you read the rule and do step by step follow their instruction: follow Twitter, how may Retweets/Tweets are required, how many  Retweets/Tweets are allowed in a day,... Behind you can search video related bounty on the social media to watch and learn. Good luck.