Is it possible for a facebook friend to spy everything I do on the Internet?

[Herman]

I am paranoic because I had a nerd friend and he has the bad habit of getting into people's stuff, like: he likes to read your notebooks, he investigates your name on google, and investigates everything he can almost from every human he meets. I remember he was very insitent and exited asking me to add him as a friend...

[Masters]

You're supposed to unfriend stalkers....

The other option is to delete your facebook account.

Or choose a password that isn't 1234.

[Brittania]

Please unfriend him, he sounds like a stalker. He can't spy on what you do on the internet unless he knows what your username/password is. And 'Masters' is right. Make sure your password isn't '1234'.

[Puter_Notgeek]

That's not a nerd, that is someone with way too much time on their hands.

Make sure your FB privacy settings are on, check each one.
Add him to restricted, if you want to NOT unfriend him.
Google your own name.

Wouldn't worry about it, some people think they are computer savvy, then meet the real ones.

Good Luck.

[Harry]

He can see what you post on Facebook, that's it.
There are privacy setting as well but don't trust them as Facebook regularly changes how they work and occasionally resets them.

Assume anyone you have friended can see everything on Facebook