pdfaueb.twitter.sentiment at SemEval-2016 Task 4: A Weighted Ensemble of SVMs for Twitter Sentiment AnalysisStavros Giorgis | Apostolos Rousas | John Pavlopoulos | Prodromos Malakasiotis | Ion AndroutsopoulosProceedings of the 10th International Workshop on Semantic Evaluation (SemEval-2016)