I was on the hunt for a "Donate Now" button for my non-profit page (Angel Hair Foundation) and, as is the norm, my search took me to all kinds of places (SQUIRREL!). I ended up figuring out the donation button thing (another blog post) but discoved how to add Pinterest and Twitter to my Facebook pages. Not just links, but actual feeds.
The app I like is from http://woobox.com/. Intuitive and easy to manage. I have an account now (free) and manage several client pages.