Question on ultimate facebook plugin

There is a box to log in with user name and pw but if anyone registers with this plugin may not have easy to remember user name or separate pw ,is it right?Is the box for manually registered users?

Does it plugin allow to show my facebook page on my site?

''Share albums, ‘Like’ buttons, events and registration information anywhere.''
Does it mean that users can share their FB albums and events on my site ?If so,I don't want their FB albums and events on my site,how to disable this feature?

After I activate it,will the default registration option be hidden?