Tags : UK terrorism record numbers young people uk terrorism uk record arrest terrorism related offences uk authorities arrested terrorism related offences uk authorities concern online extremism influence youths radicalization social media extremism terrorism prevention interventions extremist ideologies youth counter terrorism programme preventing radicalization hate speeches college counter terrorism measures radicalization intervention government's counter terrorism programme diverting from extremism islamist ideology extremism prevent referrals success psychological impact terrorism terrorism attacks impact terrorism prevention awareness young people terrorist involvement extremist content social media terrorism influence online terrorism impact psychological radicalization social isolation extremist ideologies youth terrorism awareness prevention counter terrorism efforts young people prevent referrals effectiveness