Adds a floating follow button (as on WP.COM Blogs) to Jetpack Powered WP.ORG sites. Use Follow Plugin if your blog isn't powered by Jetpack.
Jetpack is a WordPress plugin that supercharges your self-hosted WordPress.org powered site with the features previously only available to WordPress.com users.
But the option to add awesome follow button which appeared on bottom left corner of every WordPress.com blog os missing in Jetpack
This plugin adds the Follow Button at bottom left corner of Jetpack powered WordPress.ORG Sites.
The plugins integrates with the builtin awesome subscription manager of the Jetpack Plugin to collect subscribers email from the follow button.
NOTE: This plugin requires the Jetpack plugin to be installed & activated
If you do not use Jetpack you can download the "Follow" Plugin instead
Follow Plugin is listed in the WordPress plugin repository at http://wordpress.org/extended/plugins/follow