Bloggers and Webmasters can now add a subscribe button to their websites which would let visitors subscribe to their public posts just by clicking on the subscribe button without actually visiting their profile on Facebook.
The Subscribe Button for my profile is live in the sidebar—>
How To Add Subscribe Button to Your Blog/Website
Similar to the Like button, the Subscribe Button can be added using the XFBML version or iFrame.
For HTML5-compliant markup:
The Subscribe Button would let Bloggers gain more number of subscribers as people need not visit their profile to subscribe to their public updates. What do you think?