what does "pinned post" mean in Chinese?

Solution 1:

I believe it’s the same as “置顶文章”, where you keep the post at the top of your homepage in order for other users to see it. “置顶 “-means stay at the top. “文章”means post. In Chinese social media-weibo微博, it has the same feature to pin your weibo post at the top of your weibopage, which is called “置顶微博”—“weibo at the top”