For instance, Fu???s algo??rithms could help iden??tify what types of people turn out at a protest, he said, by rec??og??nizing gen??eral char??ac??ter??is??tics rather than indi??vidual ones: Are the people pho??tographed at demon??stra??tions such as Occupy Wall Street car??rying cam??eras and note??books, and thus likely jour??nal??ists?