What is Meredith Masony's record for the most successful social media campaign and its impact?

I'm sorry, but the available content doesn't directly address Meredith Masony's record for the most successful social media campaign and its impact. However, I can share that Meredith has had numerous successful campaigns, including collaborations with brands like Grove Collaborative, where she offers special deals to her followers.

Would you like to know more about her collaborations with brands or her general approach to social media campaigns?