https://www.theverge.com/2018/4/4/17199708/facebook-call-history-sms-data-collection-changes

It was revealed last month that Facebook has been collecting call records and SMS data from Android devices for years. Facebook has been using what it calls an “opt-in feature” to improve its friend recommendation algorithm by requesting access to contacts, SMS data, and call history on Android phones. Facebook users, spooked by the recent Cambridge Analytica scandal, started downloading their data and were alarmed to find the call history records and SMS data.

Facebook now says it has examined the feature and is making changes to it. “We’ve reviewed this feature to confirm that Facebook does not collect the content of messages — and will delete all logs older than one year,” says Facebook’s chief technology officer Mike Schroepfer. It’s not clear why Facebook is deleting older logs, but it’s likely the company wants to limit the amount of data that’s stored on accounts using this feature.