Can we get an idea of the size of people's site here? I think this is affecting authorities. I'm 160k unique visitors per day last week, everything is now disappearing. 120k this morning..
No black hat, very little crappy content, no heavy seo - my site is naturally full of decent content, clean (80% vetted) links, honest as a saint.
No panda update has affected me badly till now, afaik they all increased my traffic.
I'm now replaced by guys who've used micro html / author tags all the way across their site, and are full of +1 buttons. Clue? Currently I'm refitting all my sites to have ugly banners with +1 buttons everywhere, a horrible day.
IMHO Google has sacrificed integrity to force us to implement their G+ apis / buttons and widgets. I'm shocked. We take G+ seriously now, or pack up and go home.