For ads at least, I'm pretty sure Google and Facebook are effectively paying 100% of that. As far as I know, their ad systems work on a bidding process and common wisdom is to bid the average profitability of a new customer * the conversion rate from those that click on your ad. Thus, as long as your bid wins out (you pay the second highest price) you will make money on each ad click.
This represents a case of perfectly elastic demand. No matter how taxes change, the price the advertiser is going to bid never changes and thus all taxes will be off burdened onto google and facebooks margin until obviously the point where the would lose money and then shut it off but that's unlikely to happen.
This represents a case of perfectly elastic demand. No matter how taxes change, the price the advertiser is going to bid never changes and thus all taxes will be off burdened onto google and facebooks margin until obviously the point where the would lose money and then shut it off but that's unlikely to happen.
khan academy article on elasticity and tax revenue: https://www.khanacademy.org/economics-finance-domain/microec...