Users can access over 700,000 images, maps, posters and more as they create their VoiceThread, and it's brilliantly easy to use.
In VoiceThread, Click on "create," then upload. This opens up the "media sources" button, which allows you to choose photos from Flickr, Facebook, your previous VoiceThreads or....the NYPL.

Images are browsable by category, or you can keyword search. Click on the images you want, click "Import" and they will automatically load onto your VoiceThread. They are even already captioned, with links, for citation purposes. How cool is that?