Feb 4th - Sites Lose All Impressions

there is a widespread phenomenon that happened between Feb 3rd and Feb 4th where sites around the world lost all impressions. The only common factor seems to be that they are all relatively new sites. Not sure why this isn't being talked about more. I found a number of threads where people are chiming in from all over with the same exact scenario. February 3rd and prior the site was ranking and getting impressions. come Feb 4th to today zero impressions. A site i started in November is not longer even ranking for the exact name of the site. before Feb 4th is was number one if you searched the name. now not in top 100. all pages are still indexed anyone have any insight as to what Google did that effected so many sites overnight? please chime in if you have a site that this happened to.