Question about rich snippets.. I want to showcase reviews of the SERVICE's offered  but I am not sure if I should include them on the service page, a review page or both.  For example, we offer snow plowing and lawn care services and each service has its own page.  I have reviews for both services under the my "testimonials" page.   So, a couple questions. 1 - Should I pace a single review marked up on each service page? 2 - Does the review need to be a google review or can I use reviews from other sites?  If not, do I need to notate that somehow using the schema vocabulary?  Example, I have a 5 star review from thumbtrackDOTcom, is it ok to mark up the review and include a nofollow link? (No follow because thumbtrack is actually a competitor.) 3 - When I looked into creating an aggregate rich snippet I got confused / concerned.  Is it ok to list multiple services as a product?  Example: <div< span="">itemscope itemtype="http://schema.org/Product"> <span< span="">itemprop="name">Lawn Care and Snow Removal</span<> <div< span="">itemprop="aggregateRating" itemscopeitemtype="http://schema.org/AggregateRating">
Rated <span< span=""> itemprop="ratingValue">4.5</span<>/5 
based on <span< span=""> itemprop="reviewCount">4</span<> customer reviews</div></div<></div<> 4 - When I tested the code above, no stars showed up in the preview.  Do I need to mark up products as well?  Am I doing it completely wrong 🙂 Thanks for any advice!!