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Social media companies are to work with the Samaritans to tackle the promotion of self-harm on their sites. The firms agreed to fund the strategy at a summit in London on Monday. The Health Secretary, Matt Hancock, told MPs that they also promised to take action to stop misinformation about child vaccinations being spread. Mandy Baker reports. There's more from Today In Parliament on Â鶹Éç Radio 4 at 23.30