One of my 4 year old site was dropped from #1 to #40, now nowhere on June 21. I was running co-op ads on the site. If your site lost SERP on June 21, did you place Co-op ads or Link-Vault?
i am not using co-op or Link-vault. Use only google ad-sense with a lot unique content, discussion board and only a small part affiliate links from element5. I;m not sure of thats reason or not but will wait a little bit to see whats happend. Actually reading on another forum some sites does not use a any affiliates neither co-op or any othe link shema. This is only center where i can see old position 64.233.189.104 cache from 28 june
I also saw a drop, but it was on Jun 27th. I'm not using Co-op or LV on the site, was ranking page 1 for most of my targetted keywords, since that date though they've all dropped into 50-60's. 64.233.189.104 also shows my pre Jun 27th results.
The only site that I run coop on dropped out of the serps on June 21st as well! This site is 2 years old, and has ranked in the top 10 for loads of major keywords for 18+ months, then all of a sudden... GONE. I don't even rank for my site title anymore.