I'm surprised that pattern is still being used so much. I implemented it on a site once and regretted it. Went back to email only. What happens with multiple l

I'm surprised that pattern is still being used so much. I implemented it on a site once and regretted it. Went back to email only. What happens with multiple login choices is people forget what service they used, or end up accidentally creating another account (if it couldn't be auto-linked), or delete their fb/twitter/whatever and then lose access to things they didn't intend. Or get banned and forcibly lose access. It also means you're relying on more 3rd party dependencies. And having the overheard of managing those, keeping updated with API/policy changes. It's one of those things that seems simpler at first, but ends up being more complicated on both sides.