The spread of misinformation online is a continuously growing phenomenon that remains difficult to tackle due to its scale and complexity. Social platforms play a major role in this spread because users are simultaneously consumers and publishers of information, serving as vectors for the dissemination of content that often escapes the veracity checks applied by traditional information channels. Understanding the dynamics underlying users' online sharing choices is, therefore, a challenging yet fundamental objective for accurately characterizing the landscape of online misinformation. Although misinformation in online environments and users’ news consumption habits have been extensively studied, relatively little attention has been paid to the relationship between users and sources of the content they share in misinformation contexts.