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I rarely used WhatsApp before moving from the United States to the United Kingdom a couple of years ago, opting for the built-in messaging app on my iPhone or fellow Meta-owned platform Messenger. No one I knew in the US used it, and, in fact, I had to get friends and family members to download it when I moved so we could communicate without being charged — you're welcome, Mark Zuckerberg. Well, that seems to be changing, with the head of Meta announcing WhatsApp has reached 100 million monthly active users across the United States — with about 10 million…