Celebrities like Frank Ocean and Kehlani, along with meme-makers have jumped on the trend.

The phrase “red flag” is usually a way to suggest a warning or danger. The term is often used in dating, where people may find personality traits or preferences in a partner to be ‘red flags’, suggesting their relationship should not continue. And it seems that initially, this where the red flag emoji trend started.

Newsweek explains the meaning of the new red flag meme and shares some of the best examples.

One blog suggests the trend began among Black Twitter users, who were sharing it in the context of dating and what to look out for (and avoid) in future partners.

This snowballed and became a trend, with many more people sharing their red flags in dating, and in life, on the social media platform.

Then businesses got in on the act.

Pepsi and Twitter itself joined in on the trend, sharing their own post, which received almost 200,000 likes.

While many discussed their general dislikes using the #redflag hashtag, others kept it to dating, sharing what they fear in a partner and would likely stop a relationship from continuing.

But some have become frustrated by these red flag posts, joining in to try and stop others from sharing their pet peeves.

Some users even made fun of the idea itself, joking about actual red flags.

Most of the posts see multiple red flags following the comments, as well as videos and other memes attached to hit home the message.

Celebrities have also joined in, with Frank Ocean joking that he is, himself, a red flag, while Kehlani said people who like chicken tenders were her warning sign.

Make-up guru Jackie Aina added her two cents, saying those who call their exes ‘crazy’ should be avoided.

However, others have tried to put a positive spin on this, focusing more on the good things to look out for in people with the use of green flags.

Despite the lack of a green flag emoji, users have been sharing images or using the green tick emoji instead.

Twitter has seen a surge in many more users in recent weeks, after rival social media platforms like Facebook had tech issues which forced them to go down for hours.