Facebook: Friends list question?

[Aviatrix]

While you're looking on your friends list, you can see who deactivated their account, it shows a blank profile pic and their name. There is a friend on my list that's blank but I'm not able to click on the name to see if they deactivated it or not (the text is black instead of blue). What does that mean?
The number on my list hasn't changed

[Amanda]

May be that account is disabled by Facebook or that person has blocked you. That is why it shows in Black color