you can play online on www.newgrounds.com
Yes, you need to pay to play online on play station 4 Examples GTA Online The Crew
there is no option to play two player on GTA 5.
Yes, anyone who owns GTA V on PC, also has access to the PC version of GTA Online.
Sorry, but you can't.
You can't play it online as publishing it online is against copy-right rules.
Some PS3 games have online play. When you own the game, have an online connection, and the game disc is in the machine you can play online