Update: Both social networks are now functional again. If you can't access them in your region just yet, hold tight. Services are being restored.
Facebook and Instagram, the popular social network and it's photo-centric sub-division, are currently experiencing a denial of service attack that's affecting access for some users. If you've been trying to check your feeds and you've been getting errors, don't worry — it's them, not you.
Both Facebook and Instagram have solid infrastructure and seldom experience downtime. I'm still not able to access either but that should pass as their systems are restored. Let me know if you have access and, if not, when it gets restored.
In the meantime, if you still can't get onto Facebook or Instagram, you can still get your social fix on Twitter.