How do I get my ex to stop contacting me and my friends?

Broke up with my ex a bit ago after she was treating me like a tool and I have never been doing better. Turns out she has been mooching off my friend and is trying to get them to get us back together. She also told me (even while dating) that she was ready to hit on my friend at any time but she later found out they're not into girls. Anyway, I've been bombarded with friend/message requests from my ex and my friend's been the middle-man of it all by forwarding messages from her. I don't want to speak to my ex again and I don't want her harrassing my friend (who only got involved in the first place because of her) about me. Do I ignore her? Do I add her back as she's been asking? How should I approach this?

How do I get my ex to stop contacting me and my friends?
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