How to detect and remove inactive users?

Question

Facebook

I have 5000 friends in the muzzlebook. A limit that cannot be exceeded, and this is not very convenient when you need to add someone. I think that among these 5,000, a fifth most likely does not enter the FB at all. So the question is - is there any application that shows the activity of friends, including inactive ones? To find those "friends" and remove them...

Answer 1

that at the very bottom is not active - https://m.facebook.com/friends/center/friends