In prepared remarks to investors, Facebook CFO David Wehner said to expect revenue growth to “decelerate significantly” in the second half of this year, mainly due to a momentary boost in usage last year during pandemic lockdowns. He also cited “regulatory and platform changes, notably the recent iOS updates” from Apple.Facebook’s stock price has ballooned 39 percent since the beginning of this year, but the warning about a coming growth slowdown spooked investors, sending its stock down about 3 percent.