Apple Releases iTunes 12.4 With Design Tweaks.Apple today released iTunes 12.4, bringing some minor design tweaks and important bug fixes to its media software. iTunes 12.4 comes seven months after the launch of iTunes 12.3, which was released to the public in September, and nearly two months after the last minor iTunes update.Apple Pay holdout Walmart brings its own digital wallet to over 500 stores.While Walmart remains among the list of stores stubbornly resisting Apple Pay, the retail giant is slowly pushing forward with its own mobile payment service called Walmart Pay. An update to Walmart’s mobile app added support for the digital wallet last month, and today the retailer announced that over 500 stores across two states now support Walmart Pay at checkout.Twitter to drop links, pics from 140-character limit.Twitter users will soon have more space to craft updates on the social network.According to a report from Bloomberg, citing an anonymous source, photos and links will no longer count against the 140-character limit used on tweets. The change could arrive in the next couple weeks.Google's new social app bakes YouTube, Chrome and search into group chats.We may have more messaging apps than ever before, but sharing with small groups is still a problem — at least, according to Google.