If you are using Google Chrome browser, you now have one click solution to share any page on facebook!!! Share a link with your friends with single click. No need to depend on the website to implement the like button. How? Simply, through Facebook Like Button extension for Chrome, that according to Google's "verified author" service is indeed built by Facebook itself.
"When you click the thumbs up icon, you get a drop-down menu asking you to click an actual Like Button in an overlay. So it's two-clicks to "like" something. But it does also come with the nice ability to leave a comment as you share something (which the +1 Button extension doesn't do yet). And it adds Facebook share options to your right-click menu items. From here, you can like a page, share a page, or recommend a page."
Here is what Facebook says about the privacy:
"You do not need to be logged in to Facebook to install this plugin, but to like, share or recommend a page you will need to log in to a current Facebook account, or create a new one. While the plugin is installed, it will display the total number of likes for the page you are viewing."
"To provide a personalized experience, Facebook will see some technical information such as the URL of the page you are on, your IP address and the date and time you visited the site. All information collected before you log into Facebook is anonymous or aggregated and will not identify you."
You can download the Facebook Like Button extension Chrome Web Store.