Pakistan has blocked the popular video sharing website YouTube because of its "growing sacrilegious content".
Access to the social network Facebook has also been barred as part of a crackdown on websites seen to be hosting un-Islamic content.
On Wednesday a Pakistani court ordered Facebook to be blocked because of a page inviting people to draw images of the Prophet Muhammad.
Some Wikipedia pages are also now being restricted, latest reports say.
Correspondents say it remains to be seen how successful the new bans will be in Pakistan and whether citizens find a way round them.
YouTube says it is "looking into the matter and working to ensure that the service is restored as soon as possible". The site was briefly blocked in Pakistan in 2008 - ostensibly for carrying material deemed offensive to Muslims.
Facebook said on Wednesday that the content did not violate its terms.
There have been protests in several Pakistani cities against the Facebook competition.
