Stalkers in Internations Mexico (Mexico City)

Hi everybody.

Lately I have been having a little problem with some men that act like stalkers here in Internations and was wondering if some other person had been experiencing the same.
I have been asked (more say demanded) my phone, email and skype by men I do not know, without any other previous conversations. I did not reply and denied the contact request and this man found me on Facebook and wrote me there and then here again.

I am also aware about a couple of men that go to the parties only to harrass women and stalk them for a while (I was able to avoid one particular guy)

Has anyone else experienced that?