Our analysis shows newly-registered voters and those whose party isn't standing this time around could play a decisive role in 71 seats across the country.
Before the election we identified 71 constituencies where new voters and those without a party could swing the balance. Of those, 20 seats changed hands - most were Tory losses.
The Bureau has been given access to the first ever dataset collected on tailored messaging being targeted at specific audiences by British political parties on social media.
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