I meant specifically the "discussions", as mentioned in the 'course information' page:
>>> "Please use Piazza to discuss labs, lectures and papers. We will look at Piazza regularly and answer questions (unless one of you answers first); the entire class can see and benefit from these exchanges."
I don't think you'll be able to access these. My university uses Piazza as well and you need a university .edu email address to get access to the Piazza boards.
Fortunately, if the way MIT uses Piazza is anything like the way my school does you aren't missing much. Usually people just use Piazza to clarify something that was glossed over in lecture or to get help on some aspect of the homework.
