Social media share buttons

I wish to put Facebook, Twitter and Pinterest 'share' buttons on a flex based web mapping application that I am building. Do I need a special widget for that, or can I use code from places like sharethis.com, or addthis.com?

I do not want to do anything other than allow the user to click the button for the social media platform they want, and share/pin/tweet the link to the website on their wall.