It 's a significant fad , '' said Charles Tilly , a Columbia University social scientist and the author of '' Social Movements 1768-2004 . '' ''
Charles Tilly /business/person/company Columbia University
PRP VBZ DT JJ NN , '' VBD NNP NNP , DT NNP NNP JJ NN CC DT NN IN '' NNP NNP CD . '' ''
Charles Tilly
PERSON
Columbia University
ORGANIZATION
/business/person/company