[anothermachine]

Facebook and Twitter (and Amazon MP3) are installed by HTC/Google on the carrier-independent Nexus One, at least.

Cyanogenmod solves that problem (but introduces others, like failure to sleep properly => battery drain)

[gbog]

I don't have the cm problem you are talking about. Moreover, it is a fixable bug, not a feature like Facebook app installed by default. You are comparing apples and bananas.