How people knows that Google dance is started or Google Search Engine is updating its Index.
There is no legal announcement from any search engine that we are updating, but people like us start noticing this things by low index rate, SERP jumping and other things.
And when lots of people start noticing same thing and also in forum user start discussing it then we become sure about updates. Even lots of websites on SEO also talk about it. So keep Searching on it…;)
Some of good forum to know about Search Engine Updates:
Digital Forum
Seo Chat
Warrior forum
website Which will give Search Engine News
searchenginewatch.com
searchenginejournal.com
searchengineland.com
seroundtable.com
seobook.com
