Here are the answers for the exercises based on the definitions provided:

### Exercise 1: [Compound nouns]
1. a website that helps people communicate: **social networking site**
2. a place on the internet where you can discuss things with other people: **chat room**
3. copy programs or information from the internet to your computer: **download**
4. you type on this: **keyboard**
5. managing your bank account online: **internet banking**
6. something that is played on the internet: **online game**

### Exercise 2: [Giving opinions]
1. Everyone has an email address, I think almost.
2. I believe that this smartphone is the best you can buy.
3. It seems to me that this key is broken.
4. In my opinion, social networking is changing the way we live.
5. Most people think that children should not use rooms to chat.
6. A lot of people believe that internet banking is safe.

### Exercise 3: [Giving opinions]
(Complete the text using the words provided in the box. Please provide the box with words if you need assistance with this part.)