Snap Inc said today that its Snapchat messaging app would add an option for users to search through photos and videos that users have posted to the public. The move comes just days after larger rival Facebook Inc stepped up efforts to encourage users to take more photos and edit them with digital stickers that show the influence of Snapchat. Snapchat will enable users to search for photos and videos known as "Snaps" posted to the "Our Story" option on the app, by creating new "Stories" using machine learning technology, the company said in a blog post.