Having concerns about their methodology would imply that they've actually shared it. The closest they get is a hand-wavy answer to the discrepancies between Facebook's data and their own:
> We're saying, "Do you currently use Facebook?" Facebook is probably measuring it on, “Do you ever open the app, or do you ever use it on any level?”
That answer doesn't event make sense. Given that Edison have gone to the press to promote their report and this particular number, you'd expect them to have a good answer on the discrepancies. They should definitely know what the Facebook numbers represent, especially given Facebook publicly disclose their definition of an active user in SEC filings.
> We're saying, "Do you currently use Facebook?" Facebook is probably measuring it on, “Do you ever open the app, or do you ever use it on any level?”
That answer doesn't event make sense. Given that Edison have gone to the press to promote their report and this particular number, you'd expect them to have a good answer on the discrepancies. They should definitely know what the Facebook numbers represent, especially given Facebook publicly disclose their definition of an active user in SEC filings.