Warren Buffett contributed US$3.4 billion to five charities, making good on a pledge to give away all of his Berkshire Hathaway Inc. shares.
Research showed public trust in charities remained low, with respondents giving the sector a score of 5.5 out of 10 - around the same as in 2016, but down from 2014.
Authorities should demand an immediate investigation into all organisations, charities and companies to ensure that no one is made a victim of sexual exploitation.
London-based Henry Jackson Society says at least £6 million of taxpayers' money was given to such groups last year.
The money will go to SPCA, a hospice and a kidney dialysis body.
An Indian charity running schools for low-caste Dalit children said last week it was set to close down after its foreign funds were blocked over alleged threats to national unity.