I must say that’s pretty harsh. I use Twitter to post stuff on social media and recently sent out a Tweet to two classmates with a resource that might be helpful for them in a term project. Would that constitute cheating to a professor who didn’t know/understand/care what Twitter is for?
Just like how the traditional “water coolers” don’t exist anymore, perhaps traditional “study groups” don’t exist anymore and the web is the way to openly share ideas and learn from one another. Isn’t that the point of education anyway?