This only happens in highly competitive markets like say, cotton t-shirts, gasoline, or wheat. It is not like Facebook is now going to have charge more for a social media account to stay afloat among a sea of other social media companies. No, Facebook (and Google, etc) will have to pay their corporate tax like they should. Although I think the new US corporate tax code is already going to prevent the current evasion schemes until, of course, new ones are invented.

That's a line pushed by large corporations to convince people that money saved through tax avoision is somehow benefiting the consumer. Companies should pay their fair share of tax.

Moreover, the argument makes little sense when dealing with companies like Google and Facebook. The average consumer isn't paying for access to Google Search, Gmail, or Facebook...