In the case of apps, the Journal’s testing showed that Facebook software collects data from many apps even if no Facebook account is used to log in and if the end user isn’t a Facebook member…

In the Journal’s testing, Instant Heart Rate: HR Monitor, the most popular heart-rate app on Apple’s iOS, made by California-based Azumio Inc., sent a user’s heart rate to Facebook immediately after it was recorded.

Flo Health Inc.’s Flo Period & Ovulation Tracker, which claims 25 million active users, told Facebook when a user was having her period or informed the app of an intention to get pregnant, the tests showed.

Real-estate app Realtor.com, owned by Move Inc., a subsidiary of Wall Street Journal parent News Corp , sent the social network the location and price of listings that a user viewed, noting which ones were marked as favorites, the tests showed.