I built twournal in Drupal 6 and migrated to Drupal 7. Site featured sign in with Twitter OAuth. I accessed users tweets through the Twitter API using JSON and XML. I built an interactive demo book instantly generated from that data to show the dynamically generated book.
On the backend I built a process to generate the print ready PDFs using twitter data and used a print on demand service API to send it for the order to be fulfilled.
I also marketed Twournal using social media marketing and reaching out to various press/bloggers, running Twitter and Facebook ads.
The site had user profiles, ordering and payment processing, automatic pdf ebook generated using Twitter REST API. Also pulled images from Instagram API, Yfrog API, TwitPic API and others.