1. Netiquette is the etiquette or good manners of using the Internet.
2. Being friendly and polite shows good manners both offline and online.
3. You should ask someone's permission.
4. Be sure to protect them by removing any personal information like their name and email adress, and remove any parts that have nothing to do with what you want to share.
5. You can block them and talk to a trusted adult about how to best deal with them before responding.