Korva Coleman

When Janet Napolitano took over the Department of Homeland Security in 2009, she inherited a sprawling organization still in its infancy.

Less than a decade old, the agency had a staff of more than 200,000 employees — and they were responsible for some pretty big tasks: securing the nation's borders; responding to natural disasters; fighting terrorism; and managing cybersecurity.

Those challenges were tough then. And some are more difficult now.

Facebook announced on Wednesday that starting next week, it will begin banning white nationalism and white separatism content on its platforms. That includes its popular photo-sharing app, Instagram.