Honestly, Peter...I have never thought Facebook was for social "networking," even though it has come to be described as that sometimes. I hear/read "social media" mainly, though. That's different from social networking, I think.

Here's how I think of Facebook (not that I really use it, I just have an account that collects dust):

Primarily, I went to school with you, and I add you or you add me so we can keep up with each other. If we didn't go to school together, then, whether it's from work or whatever, we consider each other friends somehow. Other than that, I don't want you sending me a friend request. To me, Facebook is for friends and classmates. I realize some people take it beyond that, and I think that's mainly because they want a large friends list in order to look like they know a lot of people. I think that misleads other people about what Facebook is to a lot of people--it's not just "add whomever you darn well want to add." I'm sure I think the way I do about Facebook because I first signed up way back when it really was more so about students (you had to join with a university email account) and adding people you went to school with or currently attend school with, but now I just think people are so confused about how you use Facebook. "Facebook" is a play on the word "yearbook."

To me, LinkedIn is where you add people you don't know but might want to network with, so almost everyone I'm connected with on LinkedIn is someone I don't even know but we work in the same field or they're a recruiter or something along those lines.

Something I notice over and over about men--and I don't know how other women feel about it, so just speaking for myself--is I see you all express that it's better to come out and directly tell someone you don't want XYZ with them, i.e. "I don't want to be Facebook friends" or "I don't want to go out with you." Personally, I can't understand that, and I don't think it's nice and don't feel comfortable doing that. I'm not saying I would block someone on Facebook whose friend request I don't want to accept, but ignore them? Absolutely. I do ignore them. Is that nicer than saying "I don't want..."? I don't know...but I feel like the message is just as clear without having to directly reject someone and that you should just get the message (which, I feel like direct rejection is the most painful, personally, which is why I don't do it to other people). I feel the same way about dating and telling guys I don't want to go out with them, and I feel the same way about employers not sending emails letting us know they're not going to hire us. :\

So, I don't know how much of what I'm saying has to do with people actively blocking you, especially since I'd just ignore you vs blocking you.