 Complete the following phrase:  Facebook and Twitter became more active in banning extremists from their platform in the wake of the tragedy. Facebook pages associated with Future Now Australia had been removed from the platform, including their main page, Stop the Mosques and Save Australia. Far-right activist leaders in Australia urged their supporters to follow them on Gab after being banned from Twitter and Facebook. On March 28, 2019, Facebook announced that they have banned white nationalist and white separatist content along with white supremacy. Patrick Crusius the man responsible for the 