alt Hacker NewsYou sound like someone that wants to normalize bad behavior. Good luck with that. I would never use a social networking site to find people or jobs. I'm not going to put support behind a entity that doesn't respect privacy and the fact that they are people who don't care, like you, are the problem and why we are in the situation we are in as a country at this point.
I won't call it a social networking site. I'd call it a business-card-exchange site, plus a corporate-flyers-handout site, and of course a self-promotion site.
Selling emails is of course bad, but expecting your email that you give to any big corporation to stay private for a long time is, alas, naïve. I've read the fine print; in most EULAs it includes a ton of clauses about sharing your contacts with a bunch of third parties, etc. LinkedIn, in particular, explicitly says that it may share your contacts with advertising partners.
In other words, if you need to enter this space, wear a hazmat suit, expect no niceties.