Almost one in 10 youngsters would immediately take to social media to tell their friends and followers if they saw a stranger in a risky situation, a poll suggests.
Nine percent of 18 to 24-year-olds would write a post on Facebook or Twitter or share a photo, the poll by Anthony Nolan found.
The poll comes after an epileptic woman spoke out about two strangers who refused to help her during a fit but were instead laughing and filming her on their mobile phones.
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Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
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