Tweet, Tweet: A Crash Course in Twitter for Nonprofits

"If somebody gets something in their mailbox, it's not like they're going to make copies of it and send it to all their neighbors," Haydon said. But nonprofits have been using direct mail for years, and vendors know exactly how to create success for nonprofits.

"It's a proven method, for sure. Twitter is in the very early stages of even proving anything. There have been tremendous success stories on Twitter, but I think a lot of people for the most part are really trying to get their head wrapped around what is the real business value," he added.