MCG-ICT at MediaEval 2015: Verifying Multimedia Use with a Two-Level Classification Model

The Verifying Multimedia Use task aims to detect misuse of online multimedia content and verify them as real or fake. This is a highly challenging problem because of strong variations among tweets from dierent events. Traditional approaches train the classier at message level, which ignores inter-message relations. We propose a two-level classication model to exploit the information that tweets of a same topic are probably have same credibility values. In this model a topic level is introduced to eliminate message variations. Messages are aggregated into topics as a higher level representation. Pre-results gained from classication at the topic