On social media, information spreads primarily through explicit relationships, such as follow connections, among users. However, information diffusion isn’t limited to explicit relationships alone. Users may come across posts from others via external websites or searches and subsequently repost them. The characteristics of such information diffusion, which bypass explicit social relationships, have not been thoroughly examined to date. In this paper, we examine the characteristics of nontrivial information diffusion facilitated by implicit-links among social media users. We define information diffusion that occurs without explicit social relationships as dissemination through implicit links. Utilizing three Twitter datasets, we investigate how users engage in information diffusion through implicit-links. Our findings suggest that users situated farther from the source are more inclined to involve in information diffusion via implicit-links, contrasting with those in closer proximity. This implies that implicit-links originate from sources beyond direct social connections among users. Additionally, we observe that while implicit-links have a weaker influence on diffusion size compared to explicit-links, they tend to distribute information across diverse communities distinct from the source user.