An executive was responding to a tweet asking about ads which seem to be linked to real-life conversations.
The majority of front pages deal with the crisis in Spain after Catalonia pushes for independence.
Political advertisers will have to verify their identity and their posts will carry a disclosure.
Shoppers in France have noticed butter disappearing from supermarket shelves. Is there a crisis?
A selection of the best news photographs from around the world, taken over the past week.
Japanese noodle maker Nissin Foods has created a fork to cover up loud slurping noises. But why?
Pools and sports halls across England are at risk as council budget cuts bite, say town hall bosses.
The closeness of friendships also seemed to be more important than the number.
Despite movie stereotypes, there are very few all-female cheerleading teams in Brazil.
