WATCH: Zelenskyy presents battle-scarred Ukrainian flag to Congress

Please adhere to the following guidelines to make sure you keep yourself and others safe.

• Always confirm via messages that the person is who they say they are.
• Feel free to contact them first or have a call to make sure they verify their identity.
• Never reveal information like where you live - have packages delivered to a local pickup point if you would prefer.
• Try to meet in public places in the daytime.
• Always take a phone with you, and if you can don't go alone.