Table of contents:

For a long time Facebook's business model has been transforming over and over again, with a huge user base that has not been able to take advantage of it, advertising being a constant, but which is limited by privacy issues and now it seems that Facebook would study offering paid content.
It would be a subscription service that basically allows publishers to place a payment button on their wall, to access their items on the platform. For now, this new functionality is an idea that has not yet caught on, but there have already been public signs of it, such as the words of Campbell Brown, Facebook's director of news partners, who raised this subscription service at the Summit of Information of Digital Publications of New York.
Brown didn't elaborate on the idea of Facebook subscriptions, but did note that would have both premium and value plans. This This approach lets us see two possibilities: the Premium account would give unlimited access to the contents and the economic account a certain number of articles each month.

Testing would begin in October
Anonymous sources indicate that Facebook could start testing this service next October and everything indicates that Facebook wants to place as many controls in the hands of publishers, allowing them to offer a number of free articles per month and the same amount by subscription.
Of course, the news that Facebook would study offering paid content draws attention and raises many questions, such as costs in each modality or if that opens a door for the famous social network to initiate a process of making its services non-free, it also leaves the expectation of whether the public will be interested in this product.