This made me laugh so hard. It's from the GW2 official Facebook page. The poster (RB2) is Rubi Bayer, ArenaNet Social Media Coordinator.
(source: https://www.facebook.com/GuildWars2?fref=nf )
We're currently investigating a problem with world peace in WvW. Yes, you read that right–players on competing worlds are friendly to one another. The team working on the problem has been calling it W<3W while they work to sort out the problem.
We're working hard to fix it ASAP, but in the meantime ?#GuildWars2? players on Gunnars Hold, Riverside, and Elona Reach took advantage of this one-time opportunity for an epic three-world peace march.
Enjoy, and thanks to all involved for the fun! https://www.youtube.com/watch?v=L-zuS37-0SY ~RB2