The problem with old social media profiles is that they get forgotten and then more permissions/setting become available, so they are easier to lock down, but only after the last time you were logged in. Then you let people know what your old profile name is/was.
Then people get an insight into the 'special interest' groups you're a member of
You may not care, but let me know if you want a reminder of the site & I'll DM you
Oh damn I think I already know.. thanks for the reminder!