Meta Platforms Inc. is working on more proactive chatbots that can send friendly yet unsolicited follow-up messages to users on Facebook, WhatsApp and Instagram, without being prompted to do so ...

A revenue-per-message plan lets bot creators earn money each time someone sends a message to one of their bots.

On Monday, the company introduced a revenue model that allows creators to set a per-message price for their bots so they can make money whenever a user messages them.