[Social Widget] Block reference select empty when creating a new widget instance

In order to make the Social widget work in Magento you need to create a Widget instance related to the "Main content" block reference, but sometimes because of using a custom theme the block reference select is empty.


In order to fix it you need to add to your custom design page.xml the following code inside the default namespace.

<block type="core/text_list" name="content" as="content" translate="label">  
 <label>Main Content Area</label>  

For example if you are using the Mapple theme, you need to edit the file app/design/frontend/default/mapple/layout/page.xml adding the code.


Now you can select the Main content block reference, clear the cache and the widget should appear in the product page.