LinkedIn shares are plummeting, down 37 per cent as markets opened in the US.
The falling share prices comes after LinkedIn issued a downbeat financial forecast for 2016.
The social media giant said it forecast earnings of $0.55 per share, well below analysts' expectations of $0.74 per share.
The company was let down by its revenue guidance for the first quarter of 2016, which it put at $820m, well below the consensus estimate of $866.9m. It also expects adjusted profit of about 55 cents per share, way below the average analyst estimate of 74 cents.
But chief executive Jeff Weiner said: "We enter 2016 with increased focus on core initiatives that will help drive growth and scale across our portfolio."