Be aware of scamming on steemit. Steemit is a real site. But, some scammers made many kind of scamming site. They will offer you many interesting topics such as unlimited upvote, many steem dollars. But, actually they are scammers. Be careful to login this your steemit account on their websites.
Don't trust them. Steemit also sent you this messege. Check your account. You'll find this messege.
Don't give your private key to any website.
They provide phsing links to take your steemit account access.
