When content is shared to Google +1, Google generates preview information for the user. If your content is being shared to Google but isn't showing a proper preview, there are some specific things to look for.
Specifying Google page tags
To instruct Google what to display, you need to specify Google-compatible meta tags, and update your HTML schema. Here's how:
<!-- Update your html tag to include the itemscope and itemtype attributes --> <html itemscope itemtype="http://schema.org/Article"> <!-- Add the following three tags inside head --> <meta itemprop="name" content="AddThis Tour" /> <meta itemprop="description" content="Watch the AddThis Tour video." /> <meta itemprop="image" content="http://i2.ytimg.com/vi/1F7DKyFt5pY/default.jpg" />
For more information about Googke sharing, you can check out Webmasters' Guide to +1.