I was recently asked for some video explainers for JibberJobber, prior to doing a presentation to a job club. This is what I sent:
This 4 minute overview explains what JibberJobber is and how to not be overwhelmed (or, to focus on the most important parts of JibberJobber):
The one minute video on the homepage gives a conceptual overview:
This 4 minute introduction video gives a quick overview of JibberJobber, and emphasizes the Getting Started videos:
If nothing else, go through the Getting Started Videos table of content page to see what topics you might be interested in