Fortnite Friends List Glitch: How to Fix the Bug

The Fortnite friends list glitch returned in the wake of a service outage Tuesday caused by a series of DDOS attacks against major gaming companies. Epic Games was one of several targets, others of which included Activision Blizzard. Here's how to work around the friends list glitch.
We are still actively working to resolve these issues.
— Fortnite Status (@FortniteStatus) March 17, 2020
Please note that if your Friends aren't listed in your Friends List, they will be there again when these issues are resolved.
Fortnite Friends List Glitch: How to Fix the Bug
The Fortnite friends list glitch causes players' friends lists to appear unpopulated. Although Epic Games says it has fixed the problems caused by Tuesday's DDOS attacks, it doesn't hurt to know how to enjoy Fortnite when the friends list glitch returns.
There are a few tactics to try. If your friends list is continually scrolling back up, try clicking and dragging the scrolling bar rather than scrolling as normal.
If your friends list is erroneously empty on PC, restart your Fortnite launcher. This should populate the friends list. For PlayStation 4, Xbox One and Nintendo Switch players, this means restarting the entire game.