One common point of concern is whether these third-party services are getting your Facebook login ID and password.

Not making you create yet another account and password to manage is one way they do so. These third-party services want to make it as easy as possible for you to sign up with them. The third-party service has elected not to provide its own sign in and relies entirely on using Facebook or other platforms to authenticate its users. You can log in traditionally by creating your own account, or you can choose from one of the other authentication providers, like Facebook. I’ll also refer to all the services that you’re logging into, like PhoneZoo in the original question, as “third party” services.) (Throughout this article, I’ll use Facebook as my example, but the same issues apply to using other services like Google, Twitter, and others. It’s not just Facebook: you can use your account with Google, Twitter, or some other accounts to log in at all sorts of random and unrelated services. Using large services like Facebook to provide authentication is definitely a trend I’m seeing more and more. If you must use it, make sure your Facebook account is secured.Using a unique login ID and password for each service is much more secure.

Using the same account everywhere is less secure than using same password everywhere (which you also should not do).Facebook does get information about each third-party service where you use your Facebook login.The third-party service does not get your Facebook login ID or password.Using Facebook or other online accounts to log in to unrelated services is a trend.

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