17．Sometimes what we post on social networks can have consequences （后果） we didn't expect.Most teens think they know everything about social media，but many young people got into trouble because of their online activities.
Here are some important tips.None of them can make sure 100% Internet safety，but all of them will help you to be safer online.
RULE 1：Share with care!
Not everyone will like what you write online.Think before you post something.You can never completely control who sees your texts or your pictures.Before posting，everyone should ask themselves two questions： " How will they feel if my family or teachers see this？ " and "How might this post be bad for me in three，five or ten years from now？" Considering others' feelings are very important.
RULE 2：Be polite when you write.
Imagine someone is unfriendly in real life.You don't like it，right？Well，the same is true of online communication.Politeness matters a lot，and anyone can be polite.No one likes it when you "shout" in your messages.
RULE 3：Protect and respect.
Don't share your passwords（密碼） with anyone.Don't post your home address online.Watch out for "cyberbullying （網(wǎng)絡(luò)欺凌）" —don't spread untrue news about other people，and don't speak ill of others.If you get messages like that or see them online，talk to an adult you know.
| Internet Safety |
| Background |
●Many young people have （1） because of their online activities. |
| Tips about using Internet（5） |
●Share with care!It's important to consider others'（2） as well as its influence on yourself.
●Be polite when you write.Your online （3） should be polite as no one likes people who is impolite.
●Protect and respect.Never（4） your personal information like home address online.Don't spread untrue news or speak ill of others. |
