Do you leave friends requests pending on facebook?

[Vince]

I'm curious if you are the type of person that doesn't accept or deny a freind request and how common is it for people to do this? reason why I asked is because I added a lot of people recently and I had some that accepted me and some that denied me in the beginning but after awhile I was adding more people and the majority haven't accepted or denied me. I know they sign on because they change their main profile pic, and add people to their friends list since its listed on my news feed. I guess im just paranoid thinking that some of the people are not seeing my friend request notification on their facebook? Is that even possible or they probably do see it? I just think there is just too many lately that ive sent out that have gone unanswered. I check everyday and still see pending.