Machel, Mandela's third wife who he married on his 80th birthday, said the messages "from South Africans, Africans across the continent, and thousands more from across the world" had lightened "the burden of anxiety" and brought "love, comfort and hope."
The news comes as Britain begins hosting the G8 summit, which will likely be the backdrop of some hard questions about the reaches of surveillance by the United Kingdom's Government Communications Headquarters and its American counterpart, the National Security Agency.
New data from India's National Crime Records Bureau revealed that victims knew their rapist in the majority of reported rape cases, shedding light on an assault epidemic that has elicited considerable international attention in the past few months.
The Syrian government said that Egypt's decision to cut ties with Damascus is an "irresponsible" move led by pressure from the US and Israel.
Egyptian President Muhammad Morsi on Saturday announced "definitive" plans to cut diplomatic ties with Syria and close its embassy in Damascus.
Morsi also called for a "no fly" zone over Syria.
Former US Vice President Dick Cheney expressed his whole-hearted support for the controversial NSA surveillance program in a Saturday Fox News interview, while maintaining that Obama is lacking credibility over the Syria issue.