Excerpt from John Gruber:

It also occurs to me that there’s no company in tech with as many enemies as Google. Apple, Amazon, Microsoft, Facebook, Twitter — Google has taken the fight to all of them. In this sense they’re like Microsoft 15 years ago.

Google is the next Microsoft, Microsoft is the next IBM and IBM is the next.. I don't know, I haven't been around long enough to know. Facebook is the next AOL, Twitter is the next ICQ and Apple is the next Apple.

History repeats itself and torches are passed on even in tech.

Update: You could argue Facebook is the next Google.