They have sent me many "goodies" like that over time I've been a consumer in this article (but I'm definitely not an "staff" - I have by no means even been a moderator on any SO web page). 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 The generic term is “advertising elements” or (somewhat obnoxiously) https://sexeslive.com/