Today people use social networking site not only to make friend but also to share their contents.
Facebook offer a share dialog to share a link or page URL. people can share links on their timeline, in groups, or to their friends.
You can use following code to share link or page URL
<a href="https://www.facebook.com/sharer/sharer.php?u=http%3A%2F%2Ffbchandra.com" target="_blank"> Share on Facebook </a>