It looks as though another Steemian I follow, @celinavisaez, got her account hacked last night. The last time I saw this it happened to a long time member of the community so this is not a newbie mistake.
When you do certain things on Steemit, the site stupidly asks for the optional Master, Owner or Active Key, as shown in the sample below:
Such a page can easily be duplicated by a hacker and hosted on another website!!!!
Don't ever use your Master or Owner key!! If they get your Active key they can steal whatever is not powered up, but having your master key means they can change your other keys making it impossible for you to change the Keys to take back control.
Should this ever happen to you then this is the first step you should take: https://steemit.com/recover_account_step_1
Be careful folks.