LONDON (AP) — WhatsApp said Monday that users will start seeing ads in parts of the app, as owner Meta Platforms moves to cultivate a new revenue stream by tapping the billions of people that use the messaging service. Advertisements will be shown only in the app's Updates tab, which is used by as many as 1. 5 billion people each day. However, they won't appear where personal chats are located, developers said. “The personal messaging experience on WhatsApp isn’t changing, and personal a...