As correctly stated by Andrew (Andy) Haldane from the Bank of England in a speech he gave earlier this year, it runs through their volume (cross-section), their velocity (frequency) and their variety. One needs efficient data analytics tools to use the data properly while being aware of their limitations in terms of privacy and confidentiality.
And just one final comment: although, as central bankers, it is our job to be “concerned”, this time there is really much cause for worry. That I, at my 40 years of age, am concerned is perhaps not as important as the fact that reputed central bankers of 60 and more are – and they have already been through thick and thin.