For some reason, the Internet is swamped with people saying
雪花飘飘 北风萧萧
Xuě huā piāo piāo \\ běi fēng xiāo xiāo
For example the HSK Official Twitter account tweeted (the hashtag #xuehuapiaopiaobeifengxiaoxiao is also atwitter):
I've worked out that it's the lyrics from the song 一剪梅 (YouTube). But I don't understand why it's suddenly so popular; I'm guessing it's the Chinese equivalent of Rickrolling (YouTube). Hopefully someone can clarify.
Question: Why is the Internet saying 雪花飘飘 北风萧萧 all of a sudden?