I've watched a little of Celeb BB and know one or two but the rest were complete unknowns to me so I looked up who they were and it seems they are mostly ex reality stars. I don't mind reality programmes but my personal definition of a celebrity is someone with a skill or talent that's outside the norm and someone who excels in their field. A great actress or a great sportsman and not someone who was a bit of a plank and got thrown off from a singing contest. Do you judge someone a celebrity if they get their face in the papers often enough or do you think it cheapens 'real' talent by labelling any old Joe a celeb?
The word has never had any meaning for me. Now it has no meaning for the rest of the universe, or shouldn't!
You can have talent and still not be a celebrity in my eyes. Such as X-Factor winners. They have the talent of being able to sing, but I wouldn't consider them a celebrity (to me anyway) but I'd look to people as celebrities who have excelled in their field and done something really significant without the need of a cheap boost through a "talent" show to do it.