Is Google TechTalk Rss Feed Hacked?

I was reading my RSS feeds on google reader. When all of sudden I saw4 new videos on the google talk RSS feed from Youtube.

I was bit surprised as I had just cleared the bunch here is what I saw

What is happening with Google, first spammers were able to  manipulate the google trends and now this?

Is it possible to hack someone’s RSS feed?

What do you think would have happened here?