The first one is a petition to get McDonalds to offer a vegetarian choice. Why? If you are vegetarian why would you go to Maccas in the first place? Seriously, if you don't like the menu, go somewhere else.
The second one just leaves me shaking my head. Apparently the food colour used in M&Ms has been linked to ADHD and hyperactivity in kids, so the petition is asking the manufacturers of M&Ms to... change dyes? Leave them uncoloured? I'm not sure on that point. But I'm thinking there's a really simple solution there, which doesn't involve getting all activist-y on a social media platform.