Web-tracking tools

Apple jams Facebook's web-tracking tools

"We're shutting that down," declared Apple's software chief Craig Federighi, at the firm's developers conference.

He added that the web browser Safari would ask owners' permission before allowing the social network to monitor their activity.

The move is likely to add to tensions between the two companies.

Apple's chief executive Tim Cook had previously described Facebook's practices as being an "invasion of privacy" - an opinion Facebook's founder Mark Zuckerberg subsequently denounced as being "glib".