Is google zebra efficient? Whats the role of it in SEO and how it will works in increasing backlinks?:o
Google zebra wasn't real...... It was a rumored update back in 2013.
You posted a bunch of basic questions. Are you taking a test on SEO or something?
Google zebra was history so forget it and keep concentrate on latest Google panda, Google penguin, and Google hummingbird which has changed all scenario of search industry.