Ask Should Snapchat influencers sign contracts for every brand partnership?

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I'm honestly a bit stumped about what comes next. I have started getting interest from brands after months of working on my Snapchat. I update my stories often and track how my audience responds.

I recently had a few discussions with brands. Some asked for a written agreement while others seemed okay just chatting about it. I keep records of all our conversations just in case.

Does everyone here sign contracts for every brand partnership as a Snapchat influencer?