How much web developers charge for social networking website?

[Web Head]

From India, if you hire an outsource company, expect to pay $8 to 10 per hour.
If you hire an individual from India, expect to pay $4 to $6 per hour.
Expect it to take twice as long and be half as good. I have no experience with IT from China, but I can tell you that if my experience from India IT is any clue, the people that do web design for outsource companies in India get about $4/hr and if they were in America, they would still only be worth $4/hr. (I warned you)

Expect to pay anyone in the USA $2000+ depending on features. This is a "getting started" price for basic Facebook functionality.
Expect that coming close to what you get from Facebook will take a very long time and probably cost over $6000++ when the details are finished.
You could easily pay over $50,000 depending on who you hire and what the project details are.