Don't feed the trolls.
A troll is a person who stirs up the Internet by starting arguments or upsetting people, by posting inflammatory or off-topic messages in an online community (such as a newsgroup, forum, chat room, or blog) with the deliberate intent of provoking readers into an emotional response or of otherwise disrupting normal on-topic discussion, often for their own amusement. Retaliating against trolls will only make the situation worse. If you're a victim of a troll, don't write back - simply ignore and report them.
Don't forget another human is behind the screen.
Don't say things online that you wouldn't say to someone's face. You are not anonymous on the internet. Information posted can be traced back to you.
Don't just retweet.
Retweeting is a great way to share something you think is important or funny. Don't get in the habit of retweeting everything you see and not creating your own posts. Your opinion matters too - make it count. If all you do is re-tweet, no one will take you seriously.
Don't share personal information online.
Never post your personal information, such as a cell phone number, home number, home address, or your location on any social networking site or through mobile apps like Snapchat or Instagram.
On the Internet, typing in capital letters means you are shouting.
Don't take it personally.
If you read something online that you disagree with, if you choose to reply, make it constructive. Don't reply by attacking the other person for their opinion and beliefs. Choose your words carefully. Never respond quickly when you are angry. Think it out first.
Don't use obvious passwords.
When picking passwords, the password "123456" and the word "password" top the list.
(Sunshine and letmein are also in the top.)
Don’t use your parent's name, sisters, brothers, grandkids, birthdays, phone numbers, or a keyboard row of any kind when picking your password.