I tested this the other day and it's not possible out of the box yet. The productfeed.xml file we automatically generate it not suitable for use with these services. I don't know if anyone from the community has implemented an API solution that will generate a feed and sync with the above services. You can try reaching out to some people from this list http://forums.adobe.com/message/4253161#4253161
I've shared my code which I wrote to do this. I went to see Adam at Adobe and he twisted my arm.
Let me know how you get on.