Seems like you missed the bounties hype way back 2017. Back in the days, they airdrop some tokens where you need to share on your timeline when they post something on their social media page. The amount you will received depends on how much active you are from liking, commenting, and sharing their posts. Anyone can join it as long as they have their own social media account unlike bounties where for me, it is only exclusive for members on this forum. If you don't have an account during those times and the rank is not qualified then you won't be able to participate from it.