On a website hosting a community forum that offered Google and Facebook account logins, I logged in many years ago through Facebook to post a thread.Sometime after, having forgotten the creation of the Facebook account login, accidentally logged in to post with the Google account instead.
It's assumed the website preserves the user login info according to how it was setup in Facebook and Google. Having now two versions of the same identity on the site, is there a general method of merging the website accounts into either Facebook or Google so the posts appear under one account?