Biden is not risking his reputation in a crucial election year, argues Ambassador M K Bhadrakumar.
Sandberg also plans to give to anti-poverty efforts and educational groups.
Many have pledged billions of dollars to charity.
In addition to committing $2 billion to his own foundation, the Azim Premji Foundation, the billionaire has become the first Indian to sign up for the Giving Pledge run by Warren Buffet and Bill Gates.
The business tycoon, who is also the Chairman of Azim Premji Foundation, has donated 8.7 per cent of the total stock of Wipro from his personal stock-holding for philanthropy in 2010.
Indian businessmen and philanthropy have never walked hand in hand. But change is in the air...
The seven Indian-Americans are cybersecurity firm ZScaler CEO Jay Chaudhry, founder and chairman of Symphony Technology Group Romesh Wadhwani, cofounder and CEO of online home goods retailer Wayfair Niraj Shah, Silicon Valley venture capital firm Khosla Ventures founder Vinod Khosla, managing partner of Sherpalo Ventures Kavitark Ram Shriram, Airline veteran Rakesh Gangwal and Workday CEO and co-founder Aneel Bhusri.
Giving People asks its signatories to commit publicly to give away majority of their wealth.
Another report by Oxfam had found that eight billionaires, including Bill Gates, from around the globe have as much money as the 3.6 billion people who make up the poorest half of the world's population.
Mark Zuckerberg's pledge on Tuesday to give away most of his Facebook shares, a roughly $45 billion fortune, helps cement his role as one of Silicon Valley's most generous donors.
Of the, four are co-founders of Infosys.
Few lessons world leaders can learn from Tim Cook.
It is not every day that one of the planet's richest men is arrested by his government.
Tim Cook is joining the roster of the very rich donors.
Others on the list include Warren Buffett and Astrid Menks.
IT czar Azim Premji has given away almost half of his stakeholding in Wipro, India's third largest exporter of software services, to philanthropy.
Microsoft co-founder Bill Gates tops list of the world's top 25 richest self-made billionaires.
A record-breaking year for the world's billionaires.
India's billionaires are pledging a decent amount of their wealth for the welfare of society.
Five Indian-Americans have been named among the 400 richest people in the US by Forbes, a list topped by Microsoft co-founder Bill Gates for the 21st year in a row with a net worth of $81 billion.