Don't be a mole. Never pretend to be someone else and post about DePaul. Tracking tools enable supposedly anonymous posts to be traced back to their authors. There have been several high-profile and embarrassing cases of company executives anonymously posting about their own organizations.
Take the high ground. If you identify your affiliation with DePaul in your comments, readers will associate you with the university, even with the disclaimer that your views are your own. Remember that you're most likely to build a high-quality following if you discuss ideas and situations civilly.