Google feedproxy redirector abuse

[Kenneth Porter]

I've been seeing pill spam with lots of identical URIs pointing at 
feedproxy.google.com over the last week or two. All the URI's seem to be 
this (leading http slash slash removed):

feedproxy.google.com/~r/CraigslistHoustonAllForSale/WantedSearchquothealthquot/~3/3yX2enlGlyE/
I've no idea where to report this. Going to the root of Google's site 
reveals no abuse report links.