Gigya has developed a free API to their universal “log in” application. Using their Socialize product, you can have your site vistors authenticate users via Facebook, Myspace, or other OpenID providers.

Additionally, their API can pull profile data from these Social Networks sites. This eliminates the need for the site vistor re-entering profile information (name, email, photo…).

Are there other tools you’re familiar with?

- Steve Hart