I found out, in the latest months, that someone is using my same e-mail address? Is it possible? I mean, my account is receveing notifications from Facebook or other social but I  DID NOT SUBSCRIBE ANY OF THESE! On the other hand, I have to say that I do not receive mails from strangers and I know my friends are not receiving any "weird" mail from my account. The latest proof I have is that my account is related to a profile picture that is NOT ME!

My question is: can there be two identical e-mail addresses?

thank you