It all started when mizzer Zuckerberg said that ‘HTML5 isn’t ready’ or something similar. The dudes at Sencha didn’t like the statement. Sencha are a cool bunch of people who build tools to build HTML5 apps with. So they went the whole hog and built a facebook app for mobile and cheekily called it ‘Fastbook. , And true to its name, its fast. Although it needs quite a few too many permissions to get things done, it does a really nice job.