Before Joining a bounty first I visit the website and read the whitepaper.Then know the team, advisers and the developers next follow and join in all their social media account and search for more information's about the teams. The thing that I always look in their social media accounts is a picture of them attending conference or events  and live video's answering some question about their platform.I also check the allocation of the bounty and how many participants are there if the allocation is big with few participants much better if the participants are limited,that's when I'll join the campaign.