Ex's ex?

So my ex's ex, (already sounding ridiculous) is seriously obsessed with me. The entire 4 years we were together she caused drama between us. Which is why we're not together. She and her psychotic family would tell my ex, who I was friends with on social networking, if they saw me driving or gossip about me gaining weight! Keep in Mind they have been separated for 5 years with two kids together married for one. She is now remarried with two new kids and still causing drama in my lIfe! I'm not even with him and she is still on my social networking stalking relaying everything to my ex. I have blocked her and her family, my ex and they somehow still get through! I don't even know what to do anymore? !