Flipboard, a start-up that is unveiling its iPad app on Wednesday, builds a personalized magazine full of updates, photos and articles shared by a reader’s friends or by people they choose to follow on Twitter and Facebook. Soon it plans to incorporate material from other sources, such as Flickr, Foursquare, Yelp and perhaps e-mail messages and attachments.

Flipboard arranges status update so they look like pull quotes and it prominently displays photographs. Instead of a link to an article, Flipboard shows its first few paragraphs. People can comment, just like they can on the social network, and if they want to dig deeper into an article or a user’s account, they connect to that Web page.