When I tried to include a RSS feeds web part to my public sharepoint site just the way I had done many times on intenal sharepoint sites, I found out that the RSS viewer web part was not available.
After searching the internet I found out why this was the case and I also found a workaround using a custom solution/webpart.
Even though it is possible to use RSS feeds this way on my public sharepoint site, it is not what I expected. In my opinion an RSS feed web part is such a fundamental part of websites nowadays that it should be available by default in Office 365 / Sharepoint online.
I hope that this will be corrected in the upcoming release of sharepoint (2013) for Office 365, but the preview still doesn’t provide this capability unfortunately: