If you get an email today saying that someone from your contacts list is sharing a google document with you, DO NOT OPEN IT and DO NOT CLICK THE LINK TO ACCESS THE FILE!! People who have opened it have become victims of a phishing scam.
If you click the link it'll take you to a real Google page that will then ask you for permission across all your Google accounts. If you do this it would give hackers access to all kinds of personal information. So whatever you do do NOT give them permission if you get to this. Currently Google is investigating the attack. So whatever you do don't open any Google shared documents today and tell your friends!