Stay away from this commercial operation. Just stick with the simple MOOC operators. Coursera distributed my email address to academic institutions who are relentlessly bombarding me with spam inviting me to enroll in their courses, of course each of them coming with the usual (and insulting) invitation to unsuscribe:
"To opt-out of receiving emails from this Partner, unsubscribe here."
Moreover, their user interface and control pannel is $#*!ed, overly complicated and just plain inefficient.
My 2 cents,
PR