I had a little trouble early on. I do try to log in while working at times. Mobile is ok but for the work pcs, I find that edge is the only one that I can get on. The reason is that I had signed up on Anker and here with my facebook account. So Edge is the only one that will enable the facebook log on link.
Now for Anker, I can only log on through mobile at work as any browser has the facebook link disabled. (which I should report)
But again I would love to have an ability to document an alternate log in than using just the facebook log in case it mess up with a browser update.
Coke.com has their rewards section and it allows for different log ins types is a good example.