Which element contributes most to the visibility of a web item in the ArcGIS Online search results?

The completeness of metadata significantly enhances the visibility of a web item in ArcGIS Online search results. Well-developed metadata provides essential information about the item, including its purpose, content, and usage rights. When metadata is comprehensive, it not only helps users understand the item better but also improves indexing within the ArcGIS Online search algorithms.

This means that when users conduct searches, metadata that is thorough and well-defined can lead to the item appearing higher in search results. Complete metadata often includes detailed descriptions, keywords, and categories that align with potential search queries, thus facilitating better discoverability by users searching for relevant data or maps.

While other factors such as public sharing, thumbnail quality, and usage statistics may influence visibility, none have the same direct impact on search algorithm performance as comprehensive metadata does. A well-structured metadata set can thus ensure that items are easier to find and more appealing to potential users in search scenarios.