Doink is a VERY easy animator program, that allows you to make what is essentially a modern twist on the old-style flipcard booklet. Easy tools allow the user to draw in a frame, and then move to the next frame with a ghost of the first drawing still visible. This makes it very easy to make simple animations. Once you are done, a simple click on the play button lets the viewer see the final product.
You need at create an account to save your work, but you can capture the movie with Screencastle or Screencast-o-matic (http://screencast-o-matic.com/) If you create an account, animations can be also be posted to Facebook and Youtube.