While Facebook has offered such a service for years, called Connect, the company on Thursday introduced another option.

Unlike Connect, the new registration tool can be used by end users who don't have a Facebook account, .

It also lets publishers request additional information from end users that Facebook doesn't require in its account set-up process.

The tool, which doesn't have a specific name, is an iFrame that developers can add to their websites with one line of code.

"By minimizing the friction associated with signing up for a new account and making it easy for people to bring their friends with them, we've seen that people are more likely to complete the sign up process, stay on sites longer, share more content, and come back more often," wrote Paul Tarjan, an engineer on Facebook's application platform team.