I have successful friends. I have rich friends...

but does others' success matter to our lifes? Would we be more happy if everybody else was less happy?

Obsessing over what others have will not help us. We need to work for what we want (and all I know is I really don't need to work for Hewlett Pakard... or that I don't need huuuuuuuuuuga condo in historical building (what you cannot see on Facebook - in wintertime a good chunk of your income will go to heating. And you'll heat it to "I am not freezing anymore" point. And I don't want to go to zilions of fabulous parties, because I rather sit at home with book).

Think to yourself: would you really want a job that is fancy but exhausting? Are you really the light of every party type? Are you the type that can keep many friendships and not feel bored at times with some people? (at times I think being social butterfly is more of unpaid job then fun).
One may be unhappy in their life... but if you were dropped into life of one of those you envy on FB... would you really like it?