The campaign to free Nazanin Zaghari-Ratcliffe shows the power of online activism

Imagine a loved one goes abroad for a holiday. They get arrested, with no idea why. And they have no right to consular support that could help prove their innocence. When Nazanin Zaghari-Ratcliffe left for holiday in April last year with her one-year-old daughter Gabriella, she couldn't have imagined that she would be forced into solitary confinement at one of Iran's most notorious prisons.