How much would it cost to create facebook?

[just "JR"]

You can make a FB clone for a few $1000, and you can find free scripts to do very similar stuff.
That does NOT mean you will become the next FB (as all these dreamers think they will)!
To LAUNCH FB, Zukenberg invested 34.7 MILLIONS us$.
The cost of developing a site can be from $1000 to a few $1000's.
MAKING IT WORK (that is, getting the right visitors), is what so few people realise: it costs a HUGE amount of money to launch and advertise.
The smallest (successful) site I have made in the last 20 years cost $3000 to make.
It cost $2000/month, for 6 months, before it got some "results", and it took a total of $28,000 BEFORE it became profitable... (through TV advertising, at $1000's for 30 seconds ad show).
Another successful I participated in the making cost well over $20,000 to make, they STILL (after years) spending $1,000,000/year in advertising... but make $4mil profit per year...

When people will start realising that, maybe a few dreams will stop flying around...