Basically, as the Title suggests, are there any open source PHP scripts out there that make it any easier to integrate logging into my website with Google, Facebook and Twitter accounts?
Right now, my sites just have a way to create an account with a email address and password, but I need to add the other methods as well.
The site is PHP/MySQL.
Both Facebook and Twitter use OAuth, for which there are a number of PHP libraries available, you may have better luck googling it like that.
Google uses OpenID, I’m sure a library for that is available too.