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Using the Google+ news to make a point about attack surface: Your old online accounts can put you at risk even if you're not using them anymore.

https://www.washingtonpost.com/technology/2018/10/08/laughing-google-bug-youre-making-big-mistake/

Taking it a bit further:

Does the account still have access to anything else? Unlink it!

Do you use the same password anywhere else? Change those passwords!

Does it have private information on it that could be used to impersonate you on another account? Think about whether you still want to keep it around.