Twitter, the San Francisco based social media site has announced on Friday suspending more than 125,000 accounts over the past six months. The suspension move removes the accounts on the allegation of threatening or promoting terrorism mainly related to the Islamic States, also known as ISIL or ISIS. This is the first time; Twitter has disclosed the number of accounts deleted.

Twitter and other social sites have been criticized heavily for not effectively policing against the extremist groups. Pressure has been mounted up from Obama administration and other president hopefuls in the verge of terrorist attacks in Paris and San Bernardino County, reports USA Today.

The IS use popular Internet services, such as Twitter and Facebook, as platforms to spread propaganda and to attract new potential recruits. The terrorist group has been using Twitter as a mean to celebrate terrorist attacks and publicize executions.

However, cracking down on users promoting violence online has been a tough challenge for social media companies since it coincides with free speech and privacy. Furthermore, several new accounts are popped up back following pulling down one account, reports SiliconBeat.

Twitter has used "proprietary spam-fighting tools" to detect accounts connected to terrorism. The company has also beefed up the size of its team reviewing accounts for suspension. However, detail on size of the team or their working pace hasn't been shared yet, reports The Hill.

Meanwhile, Facebook has also been working aggressively to keep terrorist contents off the service using technology developed to root out ISIL contents. Facebook Chief Operating Officer, Sheryl Sandberg has also appealed for spreading anti-ISIL content to counter ISIL on Facebook. The appeal has been made at the summit of World Economic Forum in Davos last month.