Wow, what a negative attitude - at the risk of getting modded down to hell, I figured I'd address some of your points. Please understand that while this might be a confrontational retort, it is in no way meant to be a flame.
A hobby is something you can actually get better at. Watching TV is not a hobby.
Actually, a hobby is defined as "an activity or interest pursued for pleasure or relaxation and not as a main occupation", so TV can be a hobby for some people. Also, people can get "better" at watching TV, by putting in more hours, watching multiple channels at once, larger screens etc...
A hobby is something to which you give sustained effort.
I dont believe that to be true, for example - I have one tabletop wargame on average every week, I'm a member of a club and it would take up maybe 3 hours of my total week? On the grand scale of things, its not an effort at all, yet in all sense of the word, is a hobby.
And photography: everybody has a digital camera now. Get real.
So? It doesn't mean that just because something is popular doesn't make it a hobby? By that reasoning, I would suggest that sport of all major forms are not hobbies, which we all know not to be the case. For the record, I don't own a camera either.
Please understand that I'm not condemning anyone, but I think a lot of us are deluding ourselves.
I actually think you're essentially condemning a lot of people in this thread, people are sharing parts of themselves so that others can learn a little about them, what their interests are - its an exercise in social networking of some kind.
You've essentially called a lot of people liars, which is never cool.