News of Google SEO

How to Get Google Page Rank, is social bookmarking helpful in it or its just waste of time..

Is there some embedded algorithm that Google gives preference to their commercial customers?

Of course it will not be admitted officially.. but does anyone have any reason to believe they are doing this, or any

examples of it?

What is the difference between Google SEO and Yahoo SEO?
I am a new SEO,i spend much time to get back links to update my rank on Google but the rank on yahoo is down.

who can help me find the reason ?

This is very simple question but its answer will be very useful from SEO point of view. In Google, you'll find two options

when searching - "the web" and "pages from country" (for example pages from Canada, pages from India etc).

So could anyone please tell me that what is the technical difference between these two option and how it effects any search?

Hi! I have a question about back links counting from Google.

Will Google won't count back links that derive from sites with being full of spamming comments?