2. Bitch about work

Hate the boss? Think that slutty colleague stole your promotion and your bonus?

Strangling colleagues from hell in real life would land you in jail, but blogging about how terrible they are may mean the end of your job.

You'll never know when someone from the office might chance on your blog or post and rat about its contents to the boss.

For security reasons and to keep business practices confidential, many companies do not allow their employees to blog about their work as well.

The bottom line: Make sure you get the okay from your human resources department (they are the guys who know best) on whether you can discuss your work online, and even then, never speak badly about your colleagues, or anyone else for that matter.

Read more: Four things you should never blog about