Red Flags on Other People’s Facebook

How an animal testing lab almost hired an animal rights activist. Thankfully, the internet never forgets and this useful circumstance led to a key finding that prevented the hiring.  

Selling pre-employment screenings to clients in Germany is quite challenging. Many companies have concerns regarding data privacy (GDPR), others do not see the value of such background checks, especially in a tight labor market where precious few qualified candidates are available. Nonetheless, the results of hiring the wrong person can be devastating. Corporate espionage, sabotage from inside, reputational damage; these are just some of the dangers that companies might run into. Although pre-employment screenings alone will never fully avert these dangers, they might at least provide indicators on security and integrity risks.

I was tasked with the following pre-employment screening last year and I would like to briefly describe the methodology that led to a key finding.

A pharmaceutical company was in the process of hiring a new laboratory assistant in the department responsible for animal testing. The final candidate agreed to a background check. I received his CV and started my research. For the sake of simplicity, I will refer to the candidate as Stefan.

Stefan did not have any notable social media presence, nor could I find him in press or media archives. Replies that I received from his former employers and his alma mater backed the claims in his CV and were full of positive appraisal. I could have stopped here, but I choose to take a closer look at Stefan’s social surroundings. While Stefan was not on Facebook, he did have an inactive profile on a German social media site called StayFriends. This site enables people to connect to former classmates. Users are categorized and linked to each other via their graduation classes.


The picture above is not related to the case and just gives an overview of StayFriends. On the left I have chosen a school, the middle section lists each graduation class (by year) for that particular school, the right panel lists all user profiles for a specific class. Another interesting aspect of StayFriends is that most users post their birthdate and year openly, thus proving another breadcrumb to follow.

Stefan’s graduation class of 2011 had roughly 15 profiles listed, most of them with a profile picture. In some cases, classmates had married and their profiles included the maiden name as well. I was able to find most of the classmates on Facebook and started looking through their profiles using IntelTechniques to “dissect” each Facebook profile. Since Stefan was not on Facebook, I assumed the greatest chance to find him would be in pictures. I concentrated on pictures posted by his classmates from the time around the graduation (plus/minus 2 years). For this, I mainly used the following queries: “Photos By User, “Photos Of – Tagged”, “Photos Interacted” and “Post by Year”. Given enough time, I could have used other queries as well. In my case, these seemed to be the most promising.


A profile belonging to a female classmate had multiple links to animal rights organizations such as PETA. Going through this profile, I actually found old pictures that included Stefan. Luckily, his appearance was distinct and had not changed much over the years. The pictures showed the then young Stefan and his classmate at a demonstration organized by an animal rights organization. This was exactly the type of red flag that Stefan’s current employer would certainly not be happy with.

We obviously change as we grow older and maybe Stefan changed his views on animal testing. My client discussed the issue with Stefan and it turned out that Stefan was reluctant to renounce his old stance against animal testing. Stefan was not hired and this background check truly proved to be worth its money.

Matthias Wilson / 12.04.2019

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