Embeds
We have a number of partners and friends who we have «shortcodes» for to make it easy for people to embed their services on WordPress.com, and in turn they usually promote us in some way. The following is how many unique posts use some of these services.
YouTube
Flickr
Vimeo
Photobucket
Polldaddy
SoundCloud
Gigya
Google Maps
SlideShare
Dailymotion