What is Facebook Connect and Facebook Opengraph?

[dan]

[nora]

Facebook’s Open Graph protocol will help cultivate richer and more useful data in an attempt to make “social” the new default of the web.

[savage]

Facebook opengraph allows apps to model a person's activities based on actions and objects where as Facebook connect helps a user to login in third party website using his/her facebook credentials. Both of these are used very much now a days by website owners to create a social experience at their websites. Integrating both of them at your website takes time effort. If you are looking for a faster solution, try third party solutions like loginradius and others easily available in the market
http://www.facebook.com/help/405977429438260/
https://developers.facebook.com/docs/con.../overview/
http://www.loginradius.com