- Twitter (social media);
- Dropbox (file sharing);
- Chegg (online textbook rentals);
- Violin Memory (flash memory arrays);
- Sugar CRM (salesforce automation);
- Foursquare (social networking);
- Spotify (subscription music streaming); and
- King (mobile games).
It's a good article and worth a read. Here's the link: http://online.barrons.com/article/SB50001424052748704329604578638300022357518.html#articleTabs_article%3D1