Thanks, that indeed seems to be what I need - except that I couldn't quite understand whether the people I want to share with also have to register at koollage.

Thanks, that indeed seems to be what I need - except that I couldn't quite understand whether the people I want to share with also have to register at koollage.com or they could simply subscribe to a RSS feed. And then, it's of course a bit risky to use that service when it might be shut down any moment.