Facebook

The activity on Facebook and Instagram included organizing counterprotests for a white nationalist rally in Washington. There's evidence of links to previous Russian disinformation efforts.

"The risk of Facebook content sparking open violence is arguably nowhere higher right now than in Myanmar," six Myanmar organizations wrote in an open letter to Facebook CEO Mark Zuckerberg in April.

Inspired by the kidnapping of Nigerian schoolgirls, Lola Omolola started a Facebook group that soared in size and quickly became a support network for women around the globe.

The Buy Nothing Project encourages people to share without money changing hands. In five years it has spread around the world on Facebook with the help of more than 3,000 volunteers.