A bidder pledged $2.68 million to a San Francisco charity in exchange for a lunch date with billionaire investor Warren Buffett. The winner of the online auction that concluded Friday on eBay Inc.’s website chose to remain anonymous. The final price fell short of last year’s $3.46 million winning pledge, which tied the previous record. As in years past, the winner gets to bring seven friends to dine with Buffett, 86, at New York’s Smith & Wollensky steakhouse. Proceeds benefit Glide, a San Francisco charity that serves meals to the homeless, hosts support groups through its women’s center for abuse victims and ... (full story)