Is your entire life online? If so, it might be time to think twice about what you share.

The internet is a vast, wonderful, dangerous place, and we're only beginning to understand the ramifications of things like social media, forums, blogs, and other venues for sharing information about our lives with the general public.

Why is sharing information online a problem?
Say you're a frequent user of Instagram, Facebook, and Twitter. You've customized the privacy settings so that only certain people can find you, and you've set it up so not everyone can read what you're posting.

However, we've all seen many examples of tweets and posts that shared way too much information, and once they're online, they don't disappear. Even deleting social media posts or blog entries doesn't entirely ensure that they're gone, thanks to initiatives like The Internet Archive.

A simple screen shot can be easily shared and just as damaging, and if the content of the picture is enticing enough, it might make its way into the broader streams of the internet and be seen by a lot more people. Potential employers often check out social media streams before they make a hire.

The next time you're about to share something over a public medium, no matter how you've tweaked security settings, remind yourself that what you're sharing will likely live somewhere on the internet forever .

A list of information you should never share online:
1.Passwords.
2.Date of birth.
3.Where you live.
4.Where you work or study.
5.Where you grew up.
6.Names of family members.
7.Credit card or other banking information.
8.Mobile number.

While some of this information doesn't really mean a lot on its own, if combined, it can be quite damaging. Secondary security questions you forgot you set up might be cracked, and then you're dealing with compromised accounts and identity theft.

One more thing to look out for is sharing high-value items. Sure, you might have finally bought that big item you've been saving up for and want to share it with friends, but you're sort of making yourself a target, especially if location sharing is enabled.

Just look at the Kim Kardashian example, where she was robbed in Paris after posting photos of expensive jewelry.

As a rule of thumb, next time you share something on a blog or on social media, imagine it being seen by everyone. That's a lot of views and, if you're excited about everyone seeing it, you're probably alright posting it.

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