  Conversations in social media often contain the use of irony or sarcasm, when
the users say the opposite of what they really mean. Irony markers are the
meta-communicative clues that inform the reader that an utterance is ironic. We
propose a thorough analysis of theoretically grounded irony markers in two
social media platforms: $Twitter$ and $Reddit$. Classification and frequency
analysis show that for $Twitter$, typographic markers such as emoticons and
emojis are the most discriminative markers to recognize ironic utterances,
while for $Reddit$ the morphological markers (e.g., interjections, tag
questions) are the most discriminative.
