Pinterest is the most popular social media site nowadays, here are the tips to increase followers and likes :

Design and post, high quality images with relative title on the image.
Connect/Build target audience.
Give appealing title to the pinboard.
Follow other people.
Maintain consistency in pin posting if possible then post regularly.
Implement pinterest button on the website, blog, social media sites etc.
Make use of hash (#) before the word which you want to tag for making the pin search friendly.
Do Repin, like and comment on other’s pins.
Tweet on twitter for the new pin.
Tag others in the comment.