In Asia, emojis and stickers on messaging apps are big, and it's common for people -- even adults -- to pay extra so they can punctuate their text messages with bears or bunnies. Now the Line messaging app says Americans are getting in on the sticker phenomenon too. Japan's Line Corp., which is trying to popularize its messaging app in the U.S., amid tough competition, launched a contest for artists to design new stickers, with people voting for winners. Line says the U.S.-focused contest brought in more than 10,000 sticker submissions and 500 million votes since it was launched in...