Pinterest

First things first: I absolutely freaking love Pinterest. I can easily spend minutes, hours, days, and nights on Pinterest, without ever getting bored. It basically covers everything I love, from cats to history, and I often find myself switching from theme to theme very quickly.
Who exactly do I follow? There really is not rhyme or reason. Most of the time, I'll "tap my app", and just see where the Pinterest faeries take me.
I did a quick search on nonprofits who use Pinterest effectively, and I really liked the angle taken by the American Red Cross. Their board consists entirely of historical photos that document the work they have done. It is simple, yet impactful. Most of the photos are in black and white, and show The Red Cross in action throughout the years. Being a history nerd, this was a great board for me to stumble upon.