To "Iranian student"
Thanks for your comments. When I speak as an official of the HabitableZone I tend to speak formally. Let me put it more casually and simply: You are welcome at the HabitableZone, and I hope you will feel comfortable and relaxed about participating here. We'll do what we can to help keep you safe.
As for the term "troll scam"...the "troll" part means what you think: somebody playing tricks or using a false identity on the Internet to cause trouble. The word "scam" is a general term for all kinds of deceptive or fraudulent activity. So a "troll scam" is just a specific kind of scam carried on by trolls.
Once again, welcome to the HabitableZone!
