Algorithms are becoming important driving forces behind the innovation of information distribution. And Weibo “Hot Search” is a typical application of algorithmic distribution mode in social media. This article，taking Weibo “Hot Search” as a case study，seeks to investigate the transition of gatekeeping power from human editors to intelligence algorithms. Based on a text analysis of Weibo’s annual reports，press releases，official statements as well as 2400 pieces of “Hottest Searches”，this study finds that the guiding values of Weibo “Hot Search” include instantaneousness，popularity，engagement，and topicality，nudging users to consume entertainment gossips. Algorithmic distribution contributes to decreasing the costs and improving the efficiency. But it also brings a series of problems，including the fragmentation of attention，the asymmetry of visibility，the “black box” nature of the algorithmic decision-making process，and the hidden nature of information control. The innovation of information distribution should be guided by algorithms ethics. And information distribution should introduce more diversified values into their algorithm systems，seeking the balance of efficiency and fairness.