Been seeing spam posts in travel and language-learning subs for the "EF Advent Challenge" that are annoying but not very well-done. Most of the posts don't even have links back to ef.edu ("Education First", some sort of student-exchange program). All these posts are some sort of travel photo, with Christmas shit (like Xmas trees and snowflakes) 'shopped into it, near-identical text, typically including the phrase "I added a bit of Christmas magic to my photo" to distract from the fact that these are probably edited to add Christmas crap to make it harder to reverse-search the images.

Accounts seem to all be recently created and have been used for nothing other than posting "EF" junk.

https://www.reddit.com/search/?q=%22EFAdventChallenge%22&type=posts&sort=new shows a bunch of them showing up in the past couple weeks.