Twitter is supported for every product inside of your ShopTab Facebook store. This feature is configured as a store-wide feature option with an on/off setting in the Customization tab in the ShopTab Admin Panel.
Example stores with Tweet buttons:
The default text for the tweet is "Take a look at this product (product link) via @ShopTab" as noted below.
You may change the text prior to the product link inside of each tweet through the Translation feature within ShopTab Admin. Place the text you would like to use to replace "Take a look at this product" and click update.