The feature would also allow users to comment on the links they share through a small pop-up window that appears on the results page when the "share" link is clicked.

The "share" button would apparently replace the "+1" button currently included with Google search results. The "share" feature would display the content more prominently on a person's Google+ profile. It apparently sends the link to a user's main content stream, whereas the +1 feature sends it to a list of +1 content in the Google+ user's profile.

Bing said its Foursquare integration began rolling out Wednesday, and will reach all U.S. users in a few months.

Google did not immediately respond to a request to comment.

The IDG News Service