Per MakeUseOf, the idea of pinning on TikTok is regarding a pinned comment. TikTok users can now pin comments to their comment sections, just like YouTube and Instagram.
There are many reasons to pin a comment. As the outlet points out, it can show a creator’s favorite comment, highlight crucial information, or discourage negative comments; after all, it can set the general tone for a comment section. Pining a comment that links to a thread can encourage other users to leave their comments. Pinning comments on TikTok can increase engagement.