CMS Facebook connect

[محروم.كوم]

My current Site requires new members to select custom information from a drop down menu in order to register. this has been crucial in keeping my members organized as well as helping my site function for what it was designed for.

If I use the Facebook connect, what should I expect?
Will people connecting thru facebook connect bypass these custom fields?
Will they be asked to choose from these custom fields before being allowed to continue?
Or will the receive a database error, making them want to leave my site and not return? __DEFINE_LIKE_SHARE__