Sellers who pay extra for visibility through Sponsored Products ads on Amazon may now have their ads appear off-Amazon as well. Amazon announced Wednesday it was expanding Sponsored Products ads to other apps and websites. All such ads will link back to the Amazon product page. “We will start small, learn, and expand as we see meaningful opportunities to enable delightful discovery and shopping experiences,” Amazon said. Early partners include “premium apps and websites” that include Pinterest, BuzzFeed, Hearst Newspapers,…