YouTube is launching a "You may know these people" suggestions box that shows you the YouTube channels of people who might be your acquaintances, and lets you easily connect and subscribe to them. “When you sent a video to a friend's email address, from your YouTube account, or if your YouTube account is linked to a Gmail account, Google’ll use this information to help identify your friends with YouTube channels, who’ve allowed themselves to be found by others.” To change or review setting, log in and visit the "Privacy" section of My Account. Look for the checkbox at the top that says "Let others find my channel on YouTube if they’ve my email address."