Well I was stalked once when I was a fresher in college. A friend of mines younger sister happened to have a crush on me, and I like her back but the problem was she was waaaaay too possessive. She'd call me day and night, stay in my room till night, and she never seemed to care about going to class at all. At the end of the day I had to tell her to give me some space...big mistake. She took it the wrong way and started following me around.
Every now and then I'd notice that someone was following me or is just happen to bump into her in different places, multiple times a day.
To solve the issue I had to report her to her elder brother who brought the hammer down on her pretty hard. After that day she never disturbed me again.
The second time I was stalked was by a grown man who happened to be gay. I suspected it, but at the time I didn't really care, especially because in my home country homosexuality is outlawed (FYI I don't believe it should be like that, everyone has a right to live their life according to their own doctrines,, no one should be forced to follow another person's moral standards). The guy in question managed to get my phone number after I'd originally given him a wrong one and that was were my nightmare started. He'd blow up my phone day and night, comment on all my pictures on Instagram Facebook and Twitter and just happen to always be near my house. Eventually I found out that he was gay and was obviously trying to get me to sleep with him after which I told him I wasn't gay and nor was I interested.
He still proceeded to keep calling me and killing my battery and coming around my house. He only stopped when I verbally abused him in public.
Sad thing is that a couple of months ago, I found out that he was trying to do the same thing to my younger brother.