NewsWhip - Chrome extension that checks how viral your content is
Spotify - Map shows when two people play same song at same time
Promo Self Serve - Launch a promotion across the internet in 90 Seconds
SoundCloud - Enjoy music & follow favourite artists
SocialRank - Graph search for TWTR. Filter by interests, location, etc
Last.fm - The world's largest online music service. Listen online, find out more about your favourite artists, and get music recommendations, only at Last.fm