Giving Tuesday debuted in 2012, combining the power of social media and collaboration to bring end-of-year giving to the forefront of holiday conversations. And it’s is working. This year donations on November 29 totaled $168MM, up 44% from last year attracting 1.5MM donors from 98 countries. Nonprofits also used this time to encourage matching gifts. The Bill and Melinda Gates Foundation matched every single donation up to $1,000. The ACLU matched donations to $500,000. And motivational....