I think this Jeff Tweet should be a Meta question, so I'm open it here:
Google has "don't be evil"; we think Stack Overflow llc's is "leave the Internet better than we found it". Thoughts?
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"Don't be evil" is at least self-centered.
The "leave the Internet better than we found it" is a bit the idealistic "let's change the world, make it a better place, for you and for me".
In this case, SO is more pretentious than Google, claiming more control over the Internet than Google itself. Wanting to make it better or worse is still trying to control and change it.