Thanks for raising this question around the RSS Connector and RSS Widget. Both will indeed create content in Jive as "external" content. To view the content directly, you'll want to mouse over the date pasted and click on it:
This should direct you to the content. For example:
I would expect there to be a separate "External" filter, such as this:
Please verify that you have "External Objects" enabled as a content type.
If this is already enabled, I would recommend submitting a support case in your private Jive Community customer group for troubleshooting assistance.
I hope this helps. Let me know if you had any other questions on this.
Thanks Jeph - it looks like I've run across a bug where the incoming items don't show in the content tab / query.