Does it look like they follow a content calendar?
Yes, post are regularly made at a rate of 1-2 day.
How many people contribute to the social channels?
The Walk Free Foundation is shown as the only contribution. It is unclear how many people this comprises. It is either a small team or one very dedicated person.
What is the message they are getting across?
They are education their follower about the scope of the issue, i.e. that it far more prevalent that one might expect.
Who are they trying to reach?
They are trying to reach socially aware people who might contribute in some way to their cause.