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These are usually done by implementing Google Checkout.

You are correct in thinking that. Nofollow links are used to say "we do not endorse this external reference", which means no PR value is passed (although, Google still reserves the right to actually pass some PR if it feels the external reference is worthy), but the external site will be crawled.  Nofollow does not stop the bots from accessing the referenced URL. With that said, you need a proper ratio of dofollow to nofollow backlinks to keep your incoming links looking organic.  For example, if 99% of your backlinks are dofollow, Google might see that as being a little fishy.  The biggest mistake people make is to not go for a backlink just because it has a nofollow tag on it.  With all the social media out there these days, and the large majority of them applying nofollow tags on all external url's, it doesn't make sense to not get your links out there regardless.  Google still sees these backlinks and recognizes them as a reference to your site/company, and there is a large signal in their current algo for that. So don't dwell on it, trust me.  You will find you're just investing too much time for something that you cannot control.  Just focus on creating relationships with relevant sites and the rest will fall into place.  Pay no attention to the nofollow tag.  Take it from a guy who used to be OBSESSED haha.  I read more source-code than actual page content for years! End note: when it comes down to it, to help put things in perspective, consider a _nofollow_backlink to your site coming from wikipedia.com or something like that.  And then consider a dofollow backlink coming from some no-name, or less reputable site than that.  You're going to see a significant increase in popularity from that one nofollow backlink than any other dofollow backlinks, no what I mean?

Hi Trenton, Thanks for writing in. Unfortunately, we aren't able to provide search volume data for keywords within out app at this time, but we are looking for a solution to include that data in the future. I sincerely apologize for the inconvenience this causes! Please let me know if you have any other questions. Chiaryn

Hey Tom, although everything you're proposing below in regards to SEO is great, and should be done anyway, I don't think that's the reason you're seeing poor (or no) performance in Google Shopping. Disclaimer, my knowledge of Google Product Search is limited to my experience in the U.S. There may be a whole different set of requirements for the UK. Over the last few months Google Product Search has been rolling out additional requirements and perhaps their most recent update(s) affected you.  I can't say for sure, but I'd make sure you are providing every attribute possible that they request, even the 'suggested' attributes. Additionally, make sure you are not providing more than one record for each Unique Product Identifier. Glancing at your site, I could not find any product SKU / UPC, etc. associated with your products, but that doesn't mean you're not providing it to Google. See here the the most recent update: Google Products Search Feed Specs/Policy Changes Hope this helps.