Facebook is launching Shops, a service that will allow businesses to display and sell products on the world’s largest social network platforms, said Mark Zuckerberg, Chief Executive Facebook on Tuesday.

The move to build up e-commerce offerings follows Facebook’s launch last year of limited shopping options on photo-sharing app Instagram and messaging app WhatsApp.

Company leaders wager making the platforms more business-friendly will generate fresh ad revenue, even as user growth slows.

Facebook Shops will tie at least some of those efforts together, enabling businesses to set up a single online store accessible via both Facebook and Instagram.

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A checkout feature will enable in-app purchases, while a more deeply integrated messaging feature will allow customers to chat with businesses through WhatsApp, Messenger, or Instagram Direct.

Zuckerberg also said the world’s largest social network would be working more closely on product integrations with Shopify and seven other online commerce platforms going forward. He had Shopify CEO Tobias Lütke join him in a live-streamed video announcing the partnerships.

Shopify’s shares sank after the initial Facebook Shops launch, then rebounded following Lütke’s appearance. Shares of both companies were up over 2% in afternoon US trade.

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As with Facebook’s other e-commerce features, Shops will be free for businesses to access with the expectation it will boost consumer engagement and ad sales.

“Our business model here is ads,” said Zuckerberg.

“Rather than charge businesses for Shops, we know that Shops are valuable for businesses. They’re going to in general bid more for ads and we’ll eventually make money that way.”

Facebook is also rolling out a tool to connect loyalty programs and a shopping feature showing product tags underneath live videos, allowing viewers to make purchases while watching. Zuckerberg said more than 800 million people engage with live videos daily across Facebook and Instagram.