Facebook will start limiting the number of published news stories that can be read for free for news organisations that have subscription payment models.

The social network's head of news partnerships, Campbell Brown, said Facebook would introduce the feature in October.

Instant Articles, a quicker way of loading news stories more quickly by hosting them in the Facebook app, does not currently allow for paywalls, making life difficult for publishers who charge for material.

This is despite Facebook becoming a major source of news for people, triggering complaints by publishers that they lose control and revenue when their stories are shared free at Facebook.