Facebook Inc. knows how much influence its news feed can have on members' behavior, and the social network is using that clout to fight Ebola.

CEO Mark Zuckerberg donated $25 million last month to fight the spread of the disease. Now, Facebook is asking users in more than 30 countries to donate to Ebola aid efforts by the Red Cross, Save the Children and the International Medical Corps, by prompting them with a button at the top of news feeds.

U.S. President Barack Obama asked Congress for $6.2 billion in emergency funding Thursday to combat the spread of Ebola and reduce risks for U.S. citizens following an outbreak that has infected more than 13,000 people and killed about 5,000, mostly in Liberia, Sierra Leone and Guinea.