Hi, and thanks for taking the time to read my bid!
It sounds like you're in need of someone with excellent editing skills, a decent level of critical thinking, and an abundance of patience. I am that someone!
I have plenty of experience with Facebook and GoogleDocs, and while I've not used Squarespace much, I am a quick learner and would be happy to put in some extra time to get to grips with it as necessary.
I'd also be very interested in helping to flesh it out, as you mentioned. What is the subject matter of the content you want to migrate?
All the best,
Dan