I have a question, as an educator many of my students seem to appropriate images and information from where ever they can find it. If it is not secured behind a wall (and for some this does not stop them) then it is all up for grabs. Yet I am left wondering about images from places like Instagram and Twitter. Clearly makers can ascribe them with a license. However, when they don't are they simply copyrighted due to the absence of any licencing?