The Insta Grammar series explores the most interesting corners of the incredibly popular social media site, Instagram.

After Cats, City, Nordic, Green, Graphic and Dogs, three new subjects are revealed: Unicorn, Cars and #fail. Hitching a ride on the back of today's unicorn trend that's flooding Instagram, Unicorn shows the most original posts revolving the mythical creatures. Cars gathers the most beautiful classic car shots, while #fail is an hilarious collection of ridiculous houses, 'creative solutions' and situational humour.