Unfortunately, a close acquaintance of mine is being stalked on Facebook by a troubled person they were once friends with. We suspect they are utilizing this method of temporary deactivations:
https://www.nbcnews.com/id/wbna46808719
Basically they can't block them or even see if they are friends with them unless they happen to be online long enough to search.
The easy answer is to not use Facebook but unfortunately Facebook is desired for posting and sharing photos with international family members and friends.
What is the next best way to solve this problem? Can we get in contact with someone at Facebook somehow to get a setting that simply unfriends people that deactivate their accounts repeatedly?
I did something like this in the past but facebook updated their design so my extension meanwhile is useless. A former friend of mine's account got compromised and was spamming me (via email) every time their account was online. This was the only way to get rid of it.