Mark Zuckerberg spent last week dragging Apple about how it could run an ecosystem for VR apps, but now it seems he’s chosen a different target: on Monday, he posted a picture of an ad for WhatsApp on Instagram, along with a comment about how the platform is more secure than iMessage. Will Cathcart, head of WhatsApp, also posted a tweet thread going over many of the same talking points.

The ad, which is shown at Pennsylvania Station in New York City, is relatively simple, making fun of the green bubble / blue bubble dichotomy and urging users to use WhatsApp instead so they can use end-to-end encryption to message privately. In his post, however, Zuckerberg is more direct, saying that WhatsApp is “far more private and secure than...

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