If you’ve been using the internet for years, you may have come across sites and apps that let you sign up for their service without having to create an account. Instead, these apps and sites used Facebook and Google’s login systems so you don’t have to give them your passwords.
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But can you use your Google login to get into Facebook and vice versa? No.
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If you thought you could log into Facebook using your Google account, you’re going to be disappointed because Facebook doesn’t use the Google Account login system. This means that changing your Google account password won’t change your Facebook account password.