Roughly every 9 seconds, someone sends out a potentially racist tweet. A new study from the British think tank Demos offers the first in-depth look at racially-charged language on Twitter, finding some 10,000 tweets per day that use language that might be considered offensive. But as it turns out, many of those tweets may not be derogatory. For example, roughly half of the tweets involve white boy, which isnt always racially charged. Others are potentially racist words used in a non-derogatory way, including appropriated words. …