I am not a fan of the tracking business models Google and Facebook use, among others (and Apple to some extent). Thus I find this sausage making tale interesting and largely familiar.

1/ With the omicron surge, I have had more friends send me screenshots of exposure notifications (EN) in the last week than I have in the last year. Here are some reflections based on the work I led at @Apple working with @Google and some thoughts on the road ahead. ? pic.twitter.com/Iw1jZdJNyE

— Myoung Cha (@cha_myoung) December 24, 2021