While pundits and analysts debate about diversity in Silicon Valley, one thing is very clear: Black Americans make up a very small percentage of tech workers. At Facebook, Google, and Yahoo, that number is a bit less than 2 percent of their respective U.S. workforces; at Apple, it's closer to 7 percent. Many executives and pundits have argued that the educational pipeline remains one of the chief impediments to hiring a more diverse workforce, and that as long as universities aren't recruiting a broader mix of students for STEM degrees, the corporate landscape will suffer accordingly. But black IT entrepreneurs and professionals tell Dice that the problem goes much deeper than simply widening the pipeline; they argue that racial bias, along with lingering impressions of what a 'techie' should look like, loom much larger than any pipeline issue.