Web applications need to be built from ground up with search and social media in mind.

The 10 Golden Principles of Successful Web Apps from Carsonified on Vimeo.

The ten rules are:

1. Speed
2. Instant Utility
3. Software is Media
4. Less is More
5. Make it Programmable
6. Make it Personal
7. RESTful
8. Discoverabilty
9. Clean
10. Playful