It's easy to share a news article from Databook:
- From your news feed, just tap the 'Share' button under the article summary.
- From the article itself, just tap the 'Share' button on the bar at the bottom of the screen.
Either way, tapping the Share button will bring up the standard iOS sharing menu.
If the messaging or social media app you are looking for isn't there, tap on 'More' to add it.