How frequently do people report being followed?

I was followed on my way home the other day and have heard other instances of this happening recently in the area. How do you advise handling a situation like that?
Occasionally people will report that they feel they were being followed. People should trust their instincts and react appropriately. That could mean changing direction, entering a public location (such as a restaurant or store), relocating to a well-lit or well-traveled location, or calling the police from a cell phone or one of the blue light phones located throughout campus. The best piece of advice we can give you is to follow your senses. If it doesn't feel right, it probably isn't. Do not hesitate to call the HUPD at 617-495-1212 or from one of the blue light phones. We strongly suggest that you program our number into your cell phone.