Dive Brief: 

• Pinterest will soon roll out a new "Related Pins" feature that will recommend posts users might enjoy based on those they've already pinned. 
• According to a Pinterest post on Pinterest's blog, "If you’ve been collecting recipes for your big holiday feast, we might show you a related Pin for fool-proof pie crust, or the perfect double-stuffed sweet potato."
• Users will be able to rate the pins on their relevance via a "thumbs up" or "thumbs down." 

Dive Insight: 

This move is likely a prep for targeting the recently launched Promoted Pins to Pinterest users. The data gathered from Related Pins will help Pinterest place Promoted Pins with the right users. The slow roll-out of both is smart both from a data collection standpoint and so the site doesn't alienate its users with the ads.