Bubble in Bubble?

I've just realized, that there is a new bubble.

Oh no, not a few one, you say - aha! I say.
There are too many bubble questions.

Agriculture, Energy, Certain commodities, now they are asking if Green is a bubble. They've been spewing web 2.0 bubble for a while.

This does lead to one crucial question though - are ALL the bubbles linked? Or are they separated?
If the bubbles are clearly and strongly linked together, what'll happen is that if they collapse, they'll collapse badly.

If they are not - then my projection is that bubble bursting will be rather subdued.

Why? My theory is this: If you are only staring at Pamela Anderson's, your eyes will be full of them. But, if you have Jenna Jamieson, Pamela Anderson, Carmen Electra and few others, then by nature of lack of attention and eyespan, they'll all seem pretty small.

Incomplete analogy, but I think my point is clear.
Are they linked?