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It can be up or down. It's more fun when it's up, but hard to get any real work done.
If you don't apply protective measures, it can spread viruses.

It has no brain of its own. Instead, it uses- and confuses- yours.

We attach an importance to it that is far greater than its actual size and influence warrant.

If you're not careful, it can get you in big trouble.

Some people have it, some don't

People who have it would be devastated if it were cut off- and they think those who don't have it want it.

People who don't have it may agree that it's a nifty toy but think it's not worth the fuss made about it.

Once you've started playing with it, it's hard to stop.

Some people would play with it all day if they didn't have to work. Of course, some people do anyways!