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

After Cats, City and 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.