I need to secure the members area of my site.
Here is what I want to do, I want to restrict users to one device (phone, laptop, computer, whatever).
Everyone enters into the site with a user name and password.
If a second device attempts to use the site, I want the account blocked.
I have to many people swapping passwords, using five devices and it is chaos.
I need suggestions on what to do, and how you would code and solve the problem, etc.
I have had suggestions about making people log in with their facebook and twitter, however, some customers may not like it, so, I just need a way to designate one device for the site.
I imagine there is a simple solution here I cannot think of!