I actually do not mind people that have the same facebook. It is alot easier then logging out to log yourself in just to post a comment. If you have the same group of friends then why not ? No harm done.
I find that really strange. I haven't seen any of my friends do that. I know I wouldn't do that and James and I are apparently legally "Defacto" which is one step off being legally married haha..
Although, if someone like Leo Decaprio was to put my last name as his, I would deff. not be running away from him!!