SPG has launched a bonus points promotion in August which you can get double/triple points for every 2+ night stay. They have extend this promotion until November 30, 2014. You must register this promotion to get the bonus points.
https://www.spgpromos.com/moreforyou/
Inside this promotion, it says when you update your SPG preferences you can also get 500 starpoints for free! This action just take you less than a minute.
You can update your profile through this link:
https://www.starwoodhotels.com/preferredguest/account/profile/update_preferences.html
You will get a email confirmation after you have updated your Preferences.
According to the terms and conditions, the 500 starpoints will post to your account 2-4 weeks after this promotion end(November 30, 2014) .
Thanks to Dealswelike for sharing this promotion.
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