I've installed Yoast SEO plugin a few days ago and after having configured it I noticed there's an issue when sharing on Google+.
Up until now, all products shared had only the product page title displayed on fb/g+, but now g+ displays the SEO title (which contains the product page name + site name) and the product name once again.
It looks like this: Product page name (sep) site title_product page name
On fb it still displays product name only, no site name involved.
Product title template is: %%title%% %%page%% %%sep%% %%sitename%%