Remember the last time you had to adjust the tuning on your TV? You knew there was a problem with the picture, because Tom Selleck had snow in his moustache and it never snows in Hawaii. You wanted to switch channels during the commercial break, but there was a chance you might come back too late and miss the exciting conclusion so you had to "stay tuned."
Today, most young adults have never even seen a rabbit ear. So please, I'm begging you. Don't tell online users to "tune in" to your live streaming video. And for Jobs' sake, don't tell people to "stay tuned" when you want them to wait for more information after a period of delay (ex: "Will Apple really release an iPhone 6 this year? Stay tuned.").