My ex keeps "liking" and commenting on my friend's Facebook posts. Call her out on it?

Anonymous
My ex ended things about 5 weeks ago and we haven't spoken at all since. She claims the long distance (2hrs) coupled with her insecurities were the reason for her ending things.

Since the split she has been consistently liking my friend's (girls and guys) posts on Facebook. I could understand if she were actually friends with them, but I introduced her to them and they literally have only met one time!!! It's not like they are running into each other randomly and became close friends--different cities. I mean WTF... is she trying to get under my skin? If she and I were still dating I could see her I'd kinda like to call her out on it but don't want it to seem like an excuse to talk to her... recommendations?
My ex keeps "liking" and commenting on my friend's Facebook posts. Call her out on it?
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