What is a google dance? According me google dance explained that how to check new rankings and PageRank during the dance.It is used to describe the index update of the google.Google's index update occurs on average once per month. It can be identified by significant movement in search results and especially by Google's cache of all indexed pages reflecting the status of Google's last spidering.
You asked and answered your own question. Outstanding scholarship! Google Dance is absolute insanity. "Yay I have a PR3 site, I'm so excited my work is paying off, I'll add a bunch of videos and content! This will be awesome, all this new unique stuff for my visitors to see!...Wait...what?...PR0?!?!?!?! WHAT!?!?! IT JUST DISAPPEARED FROM THE INDEX!!! How could this happen?! I haven't been spamming! My visitors stay on my site for HOURS and click multiple pages! My backlinks are all perfect and high PR! My traffic has been increasing steadily every month and my social media and network presence keeps gaining popularity!!!!....Oh...My site is PR4 now...yay...." ^ That is Google Dance.
Absolutely right, but the fluctuation immediately affects PR, and it either jumps up shortly or plummets due to the algorithm readjusting what it thinks your score should be. It's nuts. It almost has no rhyme or reason. At least sandbox makes sense. Dance is insanity.
I agree with you. But i wonder how the fluctuation come from and how Google determine that fluctuation..
Keyword density being too high, targeting too many high CPC and traffic keywords, having way too many ads and an abnormally high CTR