1.. Listserv: A group of people whose emails are assigned to one central address. When you send an email to the central address, everyone on the listserv receives the email.
2. Netiquette: Rules of etiquette or social behavioral expectations that apply to communication on the Internet.
3. Online bulletin boards: Websites that allow people with common interests to have discussions among a number of people about a topic of choice.
4. Social networking sites: Community websites where people communicate and network with each other in various ways.
5. Spam: Emailed advertisements that are mailed to thousands or even millions of users.
6. Spyware: Computer software that can literally spy on people's computers and reveal information about things like credit card numbers to criminals. Spyware often is spread through email attachments.
7. Virus: A computer program that does damage to computer hard drives when an infected file is opened. Viruses often are spread through email attachments.
In summary, the meanings of the given words are:
1. Listserv - a group email address where messages are sent to multiple recipients.
2. Netiquette - the rules of behavior and courtesy for online communication.
3. Online bulletin boards - websites for discussions among people with common interests.
4. Social networking sites - community websites for communication and networking.
5. Spam - unsolicited, bulk email advertisements.
6. Spyware - software that spies on users' computers and collects personal information.
7. Virus - a program that can damage computer files and systems when executed.