I recently got a replacement Retina Macbook Pro and restored via Time Machine backup. I had facebook in the notification center/share sheets installed. Ever since, neither has worked. I tried logging out, and removing it from the notification center to fix to no avail. Tried installing it again and that failed too. Is there any way to remove it altogether? Ultimately I'd like to fix it if it's possible to do without reinstalling the OS. Any advice? Oh, and yes. I realize the facebook preview is a preview.