When you open the challenge's page, this is its' content:
By downloading the image and taking a look at its' EXIF metadata, you're going to find the nickname fl0pfl0p5 in the author field. This nickname can be used as input for a tool like Sherlock, or maybe just a google search, and both will result in interesting stuff.
The google results, in special, give us a more important hint, which is this one:
When we open this reddit post, there's a comment referencing fl0pfl0p5's github user, but the person who's making this comment has a different username, which is m4r64r1n3.
Sherlock returns similar results for this different username, and by looking at its' twitter account, there's this post of a photo that they took!
By downloading this picture and using it in a reverse image search tool, such as google image's "find source", you are going to find this reddit post:
By looking at the reddit post, it was made by a third nickname (this person likes to use different nicknames, damn!), which is v1ck1v4l3:
If you search for the nickname on Google, there will be a blog with the same name and the same picture as a post!
There's an anonymous comment in the picture saying that it's not a good idea to share locations online, so it gives us a hint that the location was shared before, in the blog. Web archive to the rescue!
By picking up the picture post URL and putting it in the web archive, there will be found a snapshot of it, which contains the flag!
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