  We introduce iFacetSum, a web application for exploring topical document
sets. iFacetSum integrates interactive summarization together with faceted
search, by providing a novel faceted navigation scheme that yields abstractive
summaries for the user's selections. This approach offers both a comprehensive
overview as well as concise details regarding subtopics of choice. Fine-grained
facets are automatically produced based on cross-document coreference
pipelines, rendering generic concepts, entities and statements surfacing in the
source texts. We analyze the effectiveness of our application through
small-scale user studies, which suggest the usefulness of our approach.
