If you care about decentralization and the Steem blockchain, you should only vote for witnesses that are controlled by INDIVIDUALS. That will guarantee that we have redundancy in the network. This will help prevent outages or malicious attacks by centralized organizations.
If you have never voted for community witnesses in the past, NOW is the best time to do it. They need all the help that they can get.
If you do not want to do any research and just want to help, I suggest proxying your witness votes to 
https://beta.steemconnect.com/sign/account-witness-proxy?proxy=ausbitbank&approve=1
ps. Here's an EXCELLENT cointelegraph article explaining the current situation:
Steem Community Stands Its Ground Amid Tron Takeover