At first messaging was a draw to have people use the portal (AOL, ICQ, MSN). Later, they tried to sell the apps as another banner slot. The more recent bout ha

At first messaging was a draw to have people use the portal (AOL, ICQ, MSN). Later, they tried to sell the apps as another banner slot. The more recent bout has their own services in messaging itself; bots to provide enterprise-specific functions to Slack, payment and marketplace tie-ins to Messenger.