How do you know if a person is online or off line. What does the blue dot mean and red dot mean.

Thank you.

Also, why is it when you are in a middle of chatting and then it shows user is deactivated. What happened?

Please especially if they are in the military or say they are don't give out any of your information and don't ever give them any money. Just block them instantly. Also, look at how they write using the English language. If they are from the United States they should know how to write clear English. You can tell how they transpose words. I am always looking out for scammers especially since mingle sends out two emails when you first sign up telling us to be careful about scammers and your privacy.