These days, it's common for artists to tease a new song on Instagram before an album drops, or tweet a mysterious photo clue to send fans into a frenzy about what it could all mean.
They should all take a lesson from Adele.
The British singer, who hasn't released an album in four years, managed to cause quite a stir online Sunday when a haunting, piano-driven, 30-second clip of a song aired during the UK version of The X Factor.
It sounded like Adele. It seemed like Adele. Of course, there was no actual confirmation that it was Adele - or what it meant - but that did not stop Twitter from going into overdrive. The X Factor and the singer were both trending worldwide.