"A problem in social movement studies, in general, has been selecting on the dependent variable. This means that researchers choose movements to study based on a certain factor but then make claims based on that factor. With online Big Data, this means that we need to be careful not to choose movements to study based on high levels of Internet use and then use those cases as evidence that the Internet is critical for social movements."
Jen Schradie in 5 Reasons Why Online Big Data is Bad Data for Researching Social Movements