Allow your users to sign in using Facebook, Twitter, Gmail, and 29 other services.
Get the plugin. Activate the plugin.
Create a Singly account. Their free plan supports up to 100 user accounts.
Create a Singly App.
Go to Settings / General, fill in your Client ID and Client Secret keys, and select the services you're supporting.
Test by logging out of WordPress, and then visitng the login screen. You should see login options for each service.
Once satisified it's working, setup keys on singly.com for each of the services you want to support.
Need support with Singly? Go here.