A Twitter Meme featuring an stream of sparkles rising from an image into the caption (or descending from caption to image).
The sparkles take a form similar to the following, sometimes with the stars replaced with emojis:
[quote][code]
･ ｡
☆∴｡ *
･ﾟ*｡★･
･ *ﾟ｡ *
･ ﾟ*｡･ﾟ★｡
☆ﾟ･｡°*. ﾟ
- ﾟ｡·*･｡ ﾟ*
ﾟ *.｡☆｡★ ･
- ☆ ｡･ﾟ*.｡
- ★ ﾟ･｡ * ｡
･ ﾟ☆ ｡
[/code][/quote]
The effect doesn't carry over to Danbooru posts, because Danbooru displays the artist Commentary below the image instead of above, and also because of differences in image display size.