If you use Facebook you’ve no doubt seen numerous posts claiming you can type @highlight as a comment on that post in order to see who has been visiting your profile.
While the exact wording can vary just a bit, those posts usually read something like this:
“Type @highlight in the comments to see who’s always checking your profile. If it turns blue you got page watchers.“
Plain and simple, this is nothing more than a rather annoying hoax.
As Facebook clearly explains on this Help page, they don’t allow users to track who views their profile and they don’t allow third-party apps to track profile views either.
The reason scammers spread this hoax is because it increases the interaction with (and the popularity of) their own pages and profiles.
Have you noticed how many people take the bait and leave an @highlight comment on those posts? Those useless (to the commenter) comments often number in the thousands, and every one of them draws numerous extra viewers to that post, vastly increasing the reach, activity and popularity of the original poster’s page or profile.
After the scammer’s page or profile has reached a high level of engagement they either sell it to other scammers or use it themselves to post fraudulent Facebook ads, spread malware or perform some other malicious purpose.
In short, every time a user leaves an @highlight comment on one of these hoax posts they’re actually helping a scammer perpetuate their scams.
Now all of the above being said, @highlight does have a legitimate purpose on Facebook. If you post something and then immediately comment @highlight on that post it will attract more viewers to the post. This can be useful for posts that really need to be seen by as many people as possible (a post exposing a scam, for example).
For that reason @highlight should be used very sparingly to prevent your page or profile from being viewed as a scam outlet. Personally, I don’t use @highlight at all since it has so quickly come to be recognized as a sign that the post is a scam/hoax post.
Bottom line: Typing @highlight as a comment on someone else’s post won’t reveal who has been checking out your profile. All it does is help scammers promote their own scammy pages and profiles.