As there is no offical APi for Pinterest the simplest way to get hands on your Pin is via RSS feed . You can import and embed to your WordPress Blog Fanpage or Twitter.
The Board example is from the Social Media Menu board. To stay updated on the most popular pins you can add the Popular Rss feed. Limitation to 20 pins per board and feed so if you have 10 boards 200 images is quite nice.
My Pinterest name is metacowboy just change with yours.
Your Pinterest RSS feed
There is even more fetch most Popular Pins from Pinterest
Most popular Pins
For my case its useful to feed my Fanpages Tabs and Visual Apps with the most simple visual bookmarking tool. Finding Rss feeds for boards and People is public so you can read any feed you like.
In general the Pinterest feed just serve a thumb version of the Pin . Additional Image sizes are available if you change the last letter of the image link with _c.jpg .
_b.jpg is the standard preview thumb
_t.jpg is the smales squer image
For parsing RSS feeds you can use Yahoo Pipes a great tool to filter RSS feeds without coding.
APi endpoint : https://api.pinterest.com/v2 only mobiles are allowed to use it