Search:

Google search results are best so ti is most popular search engine.

after EMD update domain name must be relevant to the business not any keywords so please remember that thing just relevant to keywords not matched.

Godaddy is best domain registration site. It give all the possible deals and coupons also for registration of domains.

It depends on your requirement because your targeted keywords must in the domain name but not exactly match in doamin.

Google has many types and results are best for any search engine query so you must use the Google. Google is advertisement company so it give so many advertisement on sites so it is famous.

Tumblr is best way for promotion of the images and the keywords page will be rank for the keywords. So you can publish articles and all the content for your site.