Plug into possibility
Add new features or connect your favorite tools with thousands of plugins — available on all paid WordPress.com plans.
hovercards
4 Plugins
Gravatar HovercardsThis plugin enables Gravatar Hovercards in Self Hosted Wordpress Blogs. Code by Ottopress, Pluginized By Abhik.
BuddyPress HovercardsAdd themable hovercards to your BuddyPress installation.
Extended GravatarThis plugin brings Hovercard popups for your commenters via Gravatar
eewee twitter hovercardUse the system "twitter hovercard" proposed by twitter wordrpess on your site.