The UN Human Rights Committee’s General Comment No. 34 on Article 19 of the ICCPR states in this respect:

“43. Any restrictions on the operation of websites, blogs or any other Internet-based, electronic or other such information-dissemination system, including systems to support such communication, such as Internet service providers or search engines, are only permissible to the extent that they are compatible with paragraph 3. Permissible restrictions generally should be content-specific; generic bans on the operation of certain sites and systems are not compatible with paragraph 3. It is also inconsistent with paragraph 3 to prohibit a site or an information-dissemination system from publishing material solely on the basis that it may be critical of the government or the political social system espoused by the government.”