Facebook officially debuted a subscribe button for websites.
The button works just like the like plugin does on websites, says an entry on Facebook’s developer blog.
As soon as a visitor clicks on the subscribe button, public posts from the profile subscribed to appear in the subscriber’s news feed.
The current version of the subscribe button works with Facebook profiles, not pages.
The subscribe plugin already appears live on Absolute Radio, AllThingsD, ANSA.it, The Daily Beast and Newsweek, Forbes.com, GQ Italia, The Huffington Post, Mashable, Ministry of Sound, MSNBC, NME.Com, TechCrunch, Time.com, Today.com, and the Washington Post.
Below is an example of an XFBML plugin for subscribing to Mark Zuckerberg’s profile:
<fb:subscribe href="https://www.facebook.com/zuck" width="450"></fb:subscribe>
This is what it looks like in HTML5:
<div data-href="https://www.facebook.com/zuck" data-width="450"> </div>
And this is the iframe version of it:
<iframe src="//www.facebook.com/plugins/subscribe.php? href=https%3A%2F%2Fwww.facebook.com%2Fzuck &width=450&appId=APP_ID" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px;" allowTransparency="true"> </iframe>
How likely are you to use this new plugin — either as a subscriber or a website?