Youtube – Are the YouTube “Likes” public to the contacts on Google+

I'm afraid that YouTube currently only has two security settings for Playlists: Public and Private. Public means that everyone can see it (if they got to your profile); Private means that only you can see it. This is slightly different than the settings for videos.

You can "share" a private playlist but, as the message tells you, the people you shared it with won't be able to see it until you make it public. At present, there's no such thing as an "unlisted" playlist. Your options are to share the list of video separately (like in an email message) or create a public playlist anyway and figure that no one else will really be interested in it.

If your YouTube profile is fairly public with followers of your own, another option would be to create a separate YouTube profile and create a public playlist with that. Unless you attract followers in some way with that profile, it's unlikely that someone would stumble over the public playlist(s) of that second (boring) profile.

I just saw a "History" option on the left side of the YouTube page. You can see a list of the videos previously watched. Hope that helps!