Pinterest launched in 2010. It only took the service around a year and a half to become one of the top ten largest social media services on the internet.
The Pinterest design has been very influential. Large online magazines such as Mashable have adopted Pinterest style layout that place a large emphasis on images. In a world where people are sharing content through social media websites every day, it makes sense to promote your articles using images and videos.
This article by Kevin Muldoon shows the best Pinterest inspired designs available for WordPress.