to check two things.
1. The profile of the requester
How many friends do they have
And what Stories, if any, do they have posted.
2. Did they actually take the time to message me first, speak with me, or did they just click on my name due to my own experiences?
So, if your...
unless I've interacted with someone and I feel like we share things in common, I generally do not accept random friend requests. In fact, for the most part, I don't even check to see who's sent me a request. My friend request button just remains lit up.