Some of you might recognise this which popped up on my screen mid January:
In accepting this policy we’re allowing for the collection of our data including:
"battery level, signal strength, app version, browser information, mobile network, connection information (including phone number, mobile operator or ISP), language and time zone, IP address, device operations information, and identifiers (including identifiers unique to Facebook Company Products associated with the same device or account)." (1)