Some people make an impact on your life, but you may lose contact with them. That doesn't make them any less important to you. Her funeral was well attended by many who hadn't seen or spoke to her in a while, but they were there because they loved her.
I'm not very old, but I've found that as I age and move around, I tend to lose contact with people I still feel very strongly connected to and love very much. One of the main reasons I still have a Facebook account is that it helps me stay in contact, which is something I'm admittedly poor at.
> Job openings should be emailed to you directly
This scenario happened to me: I emailed my resume to a company. The company later emailed me back a few months later, asking me to come in to an interview. However, that email landed in my spam folder.
I just happened to check my spam folder and not click "Delete All" as I usually do.
I owe my entire professional career to this one lucky instance. Today, I check all my spam. I don't care how good Gmail's (or whoever's) spam filter is. One wrongly filtered message can have serious impact.
In fairness, the overwhelming majority of the emailed job openings are also copypasta's from recruiters.
If a friend dies and you only found out about via a personal Facebook message, fault your other friends for attending the funeral without you, or stop pretending this person was a valued friend.
Job openings should be emailed to you directly if you're a good fit. If it's via Facebook, it's probably a copy/pasted recruiter message, you're not special.
Mostly, if you're using a service every day, don't complain when you suddenly realize you don't know how it works.