The Guardian expects this weekend will see the millionth person install its new Facebook app, exactly a month since it was launched.

The app, which allows Facebook users to see what their friends are reading after a single sign-in when they agree to share their viewing habits, was launched on 22 September at the London leg of Facebook’s F8 conference.

Content sales and marketing director at the Guardian Chris Lawson gave the prediction at the newspaper’s Media Guardian Changing Advertising Summit 2011, which is underway in London.

Less than two weeks after launch, on 5 October, the Guardian reported 129,000 app installs generating over 600,000 story reads.

That figure is likely to grow significantly when the Guardian release up-to-date statistics, which it plans to do in the next few days.