Facebook faces first major probe by EU over its use of advertising data  

European Commissioner Margrethe Vestager: 'Facebook collects vast troves of data'

Facebook is facing its first in-depth probe by European regulators, the latest in a series of efforts to crack down on big tech market dominance across the continent.

The European Commission said it will investigate whether Facebook misuses a trove of data gathered from advertisers to compete against them in classified ads. It will also check if the company unfairly ties its Marketplace small ad service to the social network.