I did a quick search and I don't see anyone else writing about this here so I do that quickly.
Many of us here have twitter accounts and yesterday it came to be published that about 300 million accounts have had their passwords stored in an unsecure log file which basically means that anyone that could access that file (employees, some SE bots or hackers) could easily read it's content, basically 300 million passwords.
They have warned members and advised them to change passwords, and they added that there are no known breach through their security, however here many of us understand how Internet works and how vulnerable it is as content can be found and accessed if it's not being secured properly.
I have changed my passwords and I suggest to everyone to do the same. Just in case. Better be safe.