spec.addFilter(getPunctuationFilter(examples));
spec.addFilter(getSpecialWordsFilter(examples));
spec.addFilter(getSpellingFilter(examples));
spec.addFilter(getEmoticonsFilter(examples));
spec.addFilter(getUnigramBigramFilter(examples));
spec.addFilter(getParticipantsFilter(examples));
spec.addFilter(getRemoveIDFilter(examples));
spec.addFilter(getRemoveMessageFilter(examples));
//spec.addFilter(getSparseToNonsparseFilter(examples));
//spec.addFilter(getFeatureSelectionFilter(examples));