Last year in December, the 25-year-old singer announced that he was taking a break from all kinds of social media platforms, saying "taking the opportunity... To travel the world" and would "see you all next Autumn".
But for the first time in 12 months, he updated his Twitter and Instagram by posting a cryptic blue image.
The "Thinking out loud" hitmaker also changed his Twitter, Facebook and Instagram image into the same shade of blue.
Some fans speculated that "Thinking Out Loud" hitmaker is about to release his third album.