I have all our company videos organized into Channels...but are Channels private only to me? I logged in as someone else, and they didn't show up. And if they are only visible to the individual account, if they are in Groups, is that a better way to organize videos?
Channels can be a group channel or a company wide channel determined when created. It's an organizational unit basically, or a tag and doesn't have any security beyond that, the individual video's inside the channel must also have their permissions set for users to view them or see them in the channel. It will recommend the permissions based on the channel you upload into however.