Make sure to keep up with the game's facebook and twitter pages for news, events and upcoming release info. You do not have to join them unless you want to comment or be in the events.
They have weekly events and give out codes for free cars, etc. They also post codes for 1K free speed boost sometimes (4-5 times this year)
Official Facebook page:
Offical Twitter page:
It is also good to keep up with Marc's facebook and twitter pages. He is the producer for the game and tunes the cars that are released into the game.
Also, Marc and Drew produce weekly (or try to) videos answering player questions. Drew was the original community manager but Ling has now taken that role. The Ask Marc videos can be found here:
Current EA contest:
Note these are not held every week, depends on the community manager's available time. (Ling is NFS World's current CM, Drew was originally)
Fan Site contests:
Need for Speed Challenge
- Mega Mondays (facebook)
- Wicked Wednesdays (facebook)
- Tweet it Up Thursdays (twitter)
- Fun Fridays (facebook)
Current contest: 3 Weeks Of Christmas Week #3