Cleavage Appreciation Day nearly broke Twitter Friday as tweets with the hashtag #cleavageappreciationday swept across the social media site, trending nationally for parts of the day, and filling Twitter feeds with racy tweets, appalled reactions and hilarious commentary.

The holiday, which no one seems to know the origins of, apparently falls on Jan. 25, and as such Twitter was overrun with tweets of barely-concealed, appreciative responses and condemning remarks.

It seems that it's a popular holiday, however, as and exhibitionists throughout the Twitterverse came out of the woodwork to celebrate the occasion, while many other Twitter users used the hashtag to express their disgust at the spectacle.

We'll let you decide for yourself whether you want to peruse all the PG-13 photos that have flooded the web throughout the course of the day Friday, which you can do by clicking here, but below we have compiled a wide range of the tweets that made the rounds during this least-holy of holidays.

@SavannahJoLore was one of many women who embraced the holiday:

" ??? It's my day to shine! ;D Going big today. #Winning Everyone tell Savannah Lore thank you"

But there was a significant backlash from women who found the concept of a day for appreciating to be highly offensive and demeaning, as evidenced by this tweet by @LilNikkiXO:

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