"Whether it's a movie, a video game or even an artist, now you share your thoughts with just one click," Aoki wrote.

Google is also working hard to factor in social signals into some of its queries, and , promoting its results from a special section at the bottom of the page into the main results list based on their query relevance and sharpening other features.

While access to Twitter content and feeds seems uniform among search engines, Bing does enjoy preferred status with Facebook, thanks to a partnership between the two companies. That has resulted in that Bing has, like the ability to include in results links to Web sites that one's Facebook friends have "liked."