Turkish Prime Minister Recep Tayyip Erdogan threatened on Saturday to "go after" Twitter and accused the social networking site of tax evasion, AFP reported.
Erdogan's remarks came after a Turkish ban on Twitter in March.
"Twitter, YouTube and Facebook are international companies established for profit," AFP quoted him as saying in a televised address. "Twitter is at the same time a tax evader. We will go after it."
On April 3, Turkey's telecoms authority lifted a two-week-old ban on Twitter after the constitutional court ruled the block breached freedom of expression, an official in Erdogan's office said.
Erdogan reiterated on Saturday his criticism of the court's decision.
"We abided by the (court) ruling on (Twitter), but I say it again, I don't respect it," he said.
Access to Twitter was blocked on March 21 in the run-up to local elections to stem a stream of leaked wiretapped recordings of senior officials that had appeared on the site, prompting Prime Minister Tayyip Erdogan to say he would "root out" the network.
"The ban has been lifted" the official from Erdogan's office told Reuters by telephone minutes after TIB removed court orders blocking the site from its webpage.
On Thursday, Turkey's telecoms regulator said it would not end a block on YouTube, despite court rulings lifting the ban.
Authorities imposed the ban on Google's video-sharing site on March 27 in the build-up to local elections, after weeks of leaked wiretaps which had emerged online, also allegedly uncovering corruption in Erdogan's inner circle.