sorry about my terrible english :P

Hi, my son is very, very young, I cant thrust my son to PS3, since there´s soo much violence, sex and nerds online, so, I will make ONLY Wii available to him, Am I right?

LittleBigPlanet isn't too bad. You could play with him and disable people from joining, so you avoid those people.

The Wii online can be filled with ruthless swearing people as well!

Poor kid... How about letting him choose? It's the internet. No matter what system, there will be idiots.

Yeah, but there's absolutely no way to hear the idiots on Wii online, except for friend codes with Animal Crossing, Endless Ocean 2, and The Conduit, as well as Monster Hunter 3 soon enough (but that's far too complex for a kid to play anyway)

Depends on how old he is.

And yes, there are violent games on Wii, like Manhunt 2. There are child-friendly games on PS3, like LBP.

Yes, I would say that there is a natural progression of starting with Ninty and eventually many move on to Sony or Microsoft.

No way wrong decision! He could play LittleBigPlanet, Gran Turismo, etc. on the PS3 for sure!

How old is he? That's something we really need to know in order to answer your question.

The best thing I can tell you for now is to simply follow the ESRB, or the rating system Brazil uses. You can never go wrong with that.

Put him on XBL so he can talk shit like the other seven year olds.

lol jk

As Akvod said look at the ESRB ratings and choose the game he plays.