There is no question that Silicon Valley, Silicon Alley, Silicon Beach and all of the other places we associate with tech entrepreneurism face diversity problems.

African-American innovators represent just 5 percent of America's scientists and engineers, according to a 2010 study by the National Science Foundation.

We've covered the dearth of women and people of color with a series of our own posts and those from outside contributors. But among the entrepreneurs of color, there are several who are making an impact in their communities.

Our friends at the NPR program Tell Me More are starting a three-week Twitter journey today, in which black game-changers will each tweet a day in their lives to provide a better look at how they're making a difference, the random obstacles they may encounter and what they observe as exceptions in an industry dominated by white men. The details, from Tell Me More:

"Between Dec. 2-20, tech thinkers will live-tweet a day in their lives; they'll also provide feedback to the questions that Tell Me More has collected with #NPRBlacksinTech..."Then, on Dec. 17, Tell Me More will bring together some of these participants with other African-American technology heavyweights for a Google Plus Hangout on Air to broaden the conversation and to reflect on some of its key moments."

The participants will include Mike Street, the head of Blacks in Tech NY; Walter Kimbrough, the president of Dillard University in New Orleans; digital consultant Mike Green; Christine Johnson, who founded DiversiTech in Washington, D.C.; Nnena Ukuku, co-founder of Black Founders; and many more. We hope you'll follow along and shoot us questions.

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