Huawei Technologies has opened an account on Douyin, China’s version of TikTok, to promote the custom design services of its HiSilicon chip unit, even as the company continues to maintain a cloak of secrecy around its Kirin smartphone and Ascend AI chips. The Douyin account, set up by HiSilicon (Shanghai), said the company aimed to “enable smart devices for a fully connected world.” As of Thursday, it had three posts and nearly 50,000 followers. The first post, published on Wednesday, was a...