Well first, it's not particularly common for people to accept random friend requests on Facebook. (Nor is it particularly common for people to send random friend requests on Facebook.) If I get a friend request from someone, and I have no idea who they are, then I'm almost certain to decline it.
Just sending a friend request grants you no additional permissions whatsoever. You are not told if the friend request is declined, so if the person ignores or declines your request, you will simply never become Facebook friends, and continue to only see what they have chosen to make public. If the person does accept your friend request, then you will be notified.
Just because your friend request is accepted, that doesn't mean you will necessarily have access to more information. Facebook allows you to group friends, and create privacy settings based on those groups. For example, I have a "Restricted Access" group, where I put some people who I only want to see a limited set of info. Professional contacts are one type of person I would put in here. If I were to accept a friend request from a random person on Facebook (and I wouldn't), that's the group I would put them in, so they would not be granted any additional permissions.
Facebook is not a dating site, and it's not really a site to meet new people. It's a site to keep in touch with people you already know, and it works very well at that.
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"Musicians are the carriers and communicators of spirit in the most immediate sense." - Kurt Elling
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