This is an elliptical way of indicating that a guy has homosexual tendencies; not that there is anything wrong with that. Used in Pacfic Northwest. Most straight males abhor musicals.
Megan: "Do you think Thurmond is interested in me?"
Clarissa: Let's just say that he likes show tunes.
When an extremely annoying person on facebook *likes this* status when it's blatently nothing to like. I think they just want the attention. Maybe it's making up for something they haven't got anymore.
George Jones: "I'm REALLY having a bad daytoday."
*Luke Edmonds Likes This*