While the Zuckerbergs' gift is "pretty close to the record books," Stacy Palmer, editor of the Chronicle of Philanthropy, said it was slightly smaller than Warren Buffett's announced plan in 2006 to give away 99 percent of his wealth - a gift worth about $51.4 billion

in today's dollars. Buffett's gift was targeted to five organizations, with the bulk of it to the Bill and Melinda Gates Foundation.

The Gateses, meanwhile, who have said they will give away 95 percent of their fortune, have so far donated $31.5 billion, mostly to their foundation.

- Inquirer wire servicesEndText