Tweet, Tweet: A Crash Course in Twitter for Nonprofits

E-mail: Highly targeted (a benefit over Twitter). Behavior can be measured, e.g., how are people responding to the e-mail. Highly personalized.

"With Twitter, it's very open; pretty much everybody gets the same message," Haydon said. "So, you can't really personalize it as well, but these two [Twitter and e-mail] should work together."