Enough of the US hype , I really want to know if how much money I can bring back to India if I go to Silicon Valley now and work there for 5 years in Facebook or Google.

Good question. I will write a short answer now and later, if I remember or you remind me, I wil write a longer one. The short answer is that if you a single guy, you can save upwards $30k per year (I cleared my education loan in one year that way).  I think it will be possible to save more...but I was careless. Now, if you are married, with a single income, you can save may be 10K in cash.. But you will save 4-5k in ESPP and another 4-5k in 401k. Plus remember, your Social security tax will come back to you when you are old. To be able to save money in bay area as a married guy, your spouse must be working. You come to US/Silicon valley for a better life and exposure, not for the money. India is better place in terms of savings as a percentage of income. Don't look at NRIs who buy flats in Bangalore or Hyderabad. Most of us NRIs can only afford a 70lakk apartment...which even Indians working in India are able to afford. Hyd/Bangalore villas are for successful entrepreneurs in silicon valley...not for everybody.

I worked at a large US software corp soon after college for just over 2 years. I saved about 70k in that much time. Salaries were a bit lower at that time and this was in a slightly cheaper place than SV. The one thing to keep in mind is, don't be stingy (I had a nice car, rented in a nice place) but avoid the urge to succumb to the outstanding marketing (passive aggressive brainwashing) of all sorts of (often unnecessary) products which goes on in the US. Over a period of time, that will "integrate" to the biggest hole in your wallet. Every time you walk into a mall, if you are observant, you will notice how every psychological trick is played to get you to buy stuff even if you don't have a real need for it at that moment. If you pick up one of those objects lying in all those attractively laid out rows and piles of Green and Blue and Pink and Purple objects, once you buy something out of temptation and take it back home, neither are you going to be as excited about it, nor will it be used sufficiently to justify what you spent on it. This can extend to a lot of unnecessary clothes, shoes, books, toys, dishes, house-stuff etc. But please pay for experiences - travelling within the US and to neighboring countries, meeting new people, socializing outside self-ostracized circles of Indian professionals, exploring new hobbies - aeromodelling etc., exploring, and in short, trying to learn about what made the US what it is. (The 30k per year figure given by the other Anon looks just fine)

Expenses versus savings largely depend on which area of USA you live in. Here are some first hand figures of Silicon Valley: http://thetomorrowbeckons.blogspot.com/2014/06/how-much-would-it-professional-save-in.html

I too agree with about 30k$ per year savings. So you can save almost this amount even in India with 5-6 years experience, by working in MNCs. In US, net savings do not differ much between 5-6 year experience guy and 15-16 year experienced one(unless you become an executive level employee like VP in a very successful company.). You would not deal with corruption, bureacracy in US though.