For those of us who are Twitter-obsessed, it came as no surprise that African-Americans are the group that tweets the most. But did you ever wonder who's running things on Twitter? BlackWeb20.com compiled two lists of the 100 most powerful Black women and 100 most powerful Black men on the social networking site, using online reputation measurement tools Klout and Twittergrader to create their lists. Angela Simmons topped the list for the women and LeBron James won the #1 spot for the men. Here are the top five from both lists. Here's what you had to say: Selena commented via Facebook: "I follow Donna Brazille- the political commentator from CNN."