One of my website is related to cosmetic and plastic surgery For few days i get ranked on 3rd or 4th page for few medium competitive keywords and next day the position disappears . i meran its plus 100 or don't even find my site till 20th page. This is happening since my backlinks got a boost. I mean i updated the signature in 3 of my forums. so kind of a 400- 500 backlinks approx increase suddenly in is this this reason. This is happening since around last 17 days I am talking only about home page rankings. I have some inner pages ranked very well and stable for few medium and high competitive keywords. has this something to do with google dance? I know a bit about google dance but not completely.