for my website for some keywords my website have disappeared of google a idea why? its because of cafeine maybe?
It could be banned if you did something shady or blackhat like spamming for example or you gained a lot of backlinks in a little period of time.
If something happened in your page which will depend on keyword density . So that you may disappear from search list
I see toolbar changes, I'm guessing Google is undergoing a big update and its not yet in place in all data centers.