It's about as private as anything can be when you post your content on the internet... other users will see your content except when you message users directly or call each other. 

I don't take your data, use your data or share your data. I don't track you or your data to sell to you or you to third parties. #JustMOOCH

I have tried to make it as private as I can. I shall do what I can to maintain our privacy. 

CEO MOOCH