Twitter said it has shut down 235,000 additional accounts in the last six months for violating its policies prohibiting the promotion of terrorism, as it looks to show that it's proactively responding to critics who charge that the social media service is a haven for groups around the world advocating violence.

In February, Twitter said it had shut down more than 125,000 accounts since mid-2015 for violating its policy on terrorism, bringing the total number of suspensions for terrorism to 360,000 in the last year.

Daily suspensions of Twitter accounts are up over 80% since last year, with "spikes in suspensions immediately following terrorist attacks," according to the company.

"Our response time for suspending reported accounts, the amount of time these accounts are on Twitter, and the number of followers they accumulate have all decreased dramatically," Twitter said in a blog post. "We have also made progress in disrupting the ability of those suspended to immediately return to the platform."