In the past year, registered Twitter accounts have grown more than 1,500%, according to Biz Stone, Co-Founder of Twitter. With such an explosion of new voices, that’s a lot of tweets and noise for nonprofit campaigners to filter through.  So if you can only carve out 20 minutes a day to follow nonprofit leaders and thinkers discussing nonprofit issues on Twitter, who would they be? Tough question, right? There are so many smart folks. Here’s my top 10. Feel free to add your top picks too in the comments section.  Note: I have kept the list to only include one person per organization. And don’t forget to [...]