3 ms·Great article, very well written and clear. Also with COVID - very relevant for many of us.by guynirpaz 6y agoGreat article, very well written and clear. Also with COVID - very relevant for many of us.joemellin 6y agoAgreed on the Covid part.Pablo1856 6y agoThank you! Yes, we are putting these to work on the COVID issue with the Safegraph data consortium