I can provide some general insights.
Facebook's friend suggestion algorithm takes into account various factors to recommend potential friends to users. While Facebook has not disclosed the exact details of their algorithm, some of the factors that might influence friend suggestions include:
Mutual connections: If you and the suggested person have mutual friends or are part of the same Facebook groups, it's more likely that they will appear as a friend suggestion.
Shared interests: Facebook may suggest people who have similar interests, work in the same industry, or have attended the same events as you.
Location: People who are in close geographical proximity to you might also be suggested as potential friends.
Contact uploads: If you've uploaded your contacts to Facebook, it might suggest people from your phone's address book.
Profile views: While Facebook has not confirmed this, there is speculation that profile views may play a role in friend suggestions. However, Facebook has never officially confirmed this, and it's more likely that the other factors mentioned above are given more weight in the algorithm.
It's important to remember that the friend suggestion algorithm is complex and continually evolving. The appearance of a friend suggestion with no apparent mutual connections or any known connection does not necessarily mean that the person has viewed your profile. The suggestion might be based on other factors, such as common interests or demographics.
In any case, it's important not to jump to conclusions or make assumptions based solely on friend suggestions. If you have concerns about privacy on Facebook or any other social media platform, it's best to review your privacy settings and be cautious about the information you share online.