# Local versus Global Strategies in Social Query Expansion

## TL;DR

This paper explores how temporal social data can enhance query expansion in social media, comparing global and local strategies for better contextual retrieval of hashtag-related documents.

## Contribution

It introduces a comparison between global and local temporal strategies for social query expansion, highlighting their effectiveness in social media retrieval tasks.

## Key findings

- Local strategies outperform global ones in certain contexts.
- Temporal social data improves hashtag retrieval accuracy.
- Comparison results guide better strategy selection.

## Abstract

Link sharing in social media can be seen as a collaboratively retrieved set of documents for a query or topic expressed by a hashtag. Temporal information plays an important role for identifying the correct context for which such annotations are valid for retrieval purposes. We investigate how social data as temporal context can be used for query expansion and compare global versus local strategies for computing such contextual information for a set of hashtags.