Facebook Hacker Cup 2017 was just announced!

Quoting:

We're excited to announce the dates for the online rounds of the 2017 Facebook Hacker Cup!

- Qualification Round (72 hours): January 6, 2017 4pm PST - January 9, 2017 4pm PST
- Round 1 (24 hours): January 14, 2017 10am PST - January 15, 2017 10am PST
- Round 2 (3 hours): January 21, 2017 10am PST - 1pm PST
- Round 3 (3 hours): January 28, 2017 10am PST - 1pm PST

The exact date and location for the onsite finals are still being worked out, but we expect the finals to take place in April or May. Happy hacking!