Using WordPress.Com Search you can search anything on WordPress.Com and self hosted WordPress blogs connected with Jetpack plugin. This way you can easily get to newly posted articles on topic you re looking for. It allows you to browse most recent entries, you can follow the search via RSS or JSON and get notified and more.
You might have noticed on various popular websites showing their email subscription box at the end of their blog post’s content. Jetpack by WordPress.Com plugin provides you an email superscription widget but by default there are no options to display it else where. This tutorial explains you how you can easily display Jetpack Subscriptions box after your blog posts.
Jetpack by WordPress.Com provides you a mobile theme that you can activate from Jetpack’s main page in your WordPress admin area dashboard. By default most plugins that allows you to select positions for displaying ads like Google Adsense works only in main activated theme of your WordPress site. Hence, your blog readers who visit your site from their mobile devices get none of your ads displayed.
WordPress.com Popular Posts is a WordPress plugin for Self Hosted WP Sites, it simply displays your popular blog posts on your sidebar based on the data collected by Jetpack by WordPress.Com plugin or WordPress.Com Stats plugins.