First, HTC BlinkFeed is not an app. It is your home screen. You can access your apps on the launch bar such as calls, messages without moving away from HTC BlinkFeed. No matter where you are, simply click on the Home button to return to HTC BlinkFeed.
Second, HTC BlinkFeed lays out your news and social network content, providing a single, easy-to-read screen of all the content you care about. It makes use of the account settings you entered during the phone setup. Flipboard puts news and social networks into separate silos, which would mean more steps to get from one type of content to another. HTC BlinkFeed is not merely delivering headlines like Flipboard. You can read the entire article without leaving HTC BlinkFeed.
Finally, HTC BlinkFeed integrates information from your apps such as calendar schedules, Sense TV program reminders, link to your highlight videos, how-to tips, HTC Share, and Kid Mode. For example, at the beginning of the day, it shows your schedules for the day.