At PCPartPicker we strongly believe in giving back. To do so, we take a portion of our affiliate revenue and donate it to charity. To date we've contributed to Charity:Water and Extra Life. Through Charity:Water we've funded several large water and school projects in Malawi, Ethiopia, and Bangladesh. The time between donation and seeing the results is about 18-months, so there are projects we've funded still in the pipeline. We recently posted pictures from a recent completion report.
While we believe in giving back, we know many of you do too. So if you're already purchasing hardware for your next build, Amazon Smile lets you benefit a charity of your choosing when you make purchases through smile.amazon.com. They take 0.5% of the total of eligible items and donate that - but only when shopping through **smile**.amazon.com. The 0.5% does not change the cost of the items. Currently this offer is US only.
You can find the official explanation of Amazon Smile here.
What we've done is add a user preference for the US version of this site that lets you opt-in to Amazon Smile links for any Amazon links on the site. Look for a checkbox labelled "Use Amazon Smile Links" in either the price settings on part category pages, or in your user preferences if you're logged in. If you set this option, any links to the US Amazon site will automatically get changed to smile.amazon.com links.
So, in a nutshell: