Nope, only the extra stuff like PlayStation plus costs money. The basic stuff (downloading demos, having friends, sending messages, playing online, etc.) is all free.
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No
The PlayStation Network does not now, or has it ever, cost any money to join or be a part of. Certain things like Netflix or movie / tv show / game downloads of course you have to pay for unless they're demos or trailers, but unlike Xbox live, the PSN is totally free.
Yes you do and then the PS3 does not cost any additional money for the PSN (Playstation Network). The difference when they say that the PS3 internet is free is that the Xbox 360 must pay an additional $50 a year to use the Xbox Live
Yes it do cost money
People said 1200 on Sony PSN it's $15