Beginner: E-mail to text message service. Intermediate: Image host w/ resizing & cropping. Advanced: Classfieds site that isn't vulnerable to SQL or XSS injec

Beginner: E-mail to text message service. Intermediate: Image host w/ resizing & cropping. Advanced: Classfieds site that isn't vulnerable to SQL or XSS injections. Allows image and videos to be attached to a post. Expert - Social network w/ image/video/wall/message/friend functionality.