Using standard provisions in tax codes internet companies face low or no corporation tax bills in the countries of their customers. This issue has been repeatedly raised in the UK by Margaret Hodge, chair of the Westminster Public Accounts Committee. In relation to Google in particular much of the focus has been on whether Google has a permanent establishment in the UK.
This issue is also agitating the chair of the Italian lower house Budget Committee, Francesco Boccia, who has drafted a bill to try and force companies like Google to engage with their customers in Italy through a party that has a permanent establishment in Italy. See this report from Reuters.
The proposal would not tax the multinationals directly but would force them to use Italian companies to place their advertisements, rather than doing so through third parties based in low-tax countries like Luxembourg, Ireland or outside the European Union.
Doubts about the feasibility of such a proposal seem justified but it does show someone trying to take some action on this issue.