Facebook wants to make it easier for blood banks to find donors.

The world's largest social network said Wednesday it's rolling out a tool in the US that allows users to sign up to be a blood donor and receive notifications if a nearby blood bank needs help.

The feature was introduced in 2017 but released first in India, Bangladesh, Pakistan and Brazil.

The move highlights how Facebook is trying to show it's a force for good even as it grapples with a seemingly endless list of scandals including around user privacy.

Hema Budaraju, Facebook's director of product for health, said that many people aren't aware if an area has a blood shortage or when, where and how to donate.

The social network wants to raise awareness while making it more convenient for people to donate blood.

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