As anticipated yesterday, Facebook has announced their modifications to Project Beacon. As Search Engine Land reports, the changes include opt-in instead of opt-out for listing purchases through Project Beacon partner sites. I think we can also safely assume that the opt-in notices will be more noticeable than were the previous messages.
Among the other changes:
If a user does nothing with the initial notification on Facebook, it will hide after some duration without a story being published. When a user takes a future action on a Beacon site, it will reappear and display all the potential stories along with the opportunity to click “OK” to publish or click “remove” to not publish.