BBS is a computer server running software that allows the users to connect to the system using a terminal programme. Once logged in the user can preform functions such as uploading and downloading software and data, reading news and bulletins, and exchanging messages with other users through email, public message boards, and sometimes via direct chatting.
Pinterest is an online bulletin board which allows you to upload and download images, links, text and videos. The idea is to create boards which contain specific thing such as recipes for cakes or ideas for crafts. It works through you, the user, saving items that other users have uploaded to your own specific bulletin board or vice versa. Your account is essentially an organised bulletin board filled with ideas, videos or images that you want to save for later.
Your newsfeed is what connects you with other users and to save others posts you select the pin on the screen which will take you to your different categories by which you then select which you wish the post to go into.