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:
・ 。 ☆∴。 * ・゚*。★・ ・ *゚。 * ・ ゚*。・゚★。 ☆゚・。°*. ゚ * ゚。·*・。 ゚* ゚ *.。☆。★ ・ * ☆ 。・゚*.。 * ★ ゚・。 * 。 ・ ゚☆ 。
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.