I was shocked, for example, when I learned that a certain social network gives universal profile access to employees as a perk. That would not happen at Google. If you looked at your high-school ex-girlfriend's email, you'd be fired immediately (and deserve it).
Social is creepy, because it's all about being defined by other people, which is ridiculous and horrible. What, so do I suck at Programming Languages because I haven't trolled my 25 closest acquaintances for endorsements? Am I really going to become more credible in Machine Learning if I get 15 strangers to "endorse" me?
The major conflict in "Social" is what I call "Document vs. Improve" (or: Exploit vs. Explore). A social app can expand the web of social connections and make it more efficient, but (a) that's really hard, and (b) there isn't a lot of short-term money in it. Or it can document social relationships that already exist, and make a shit-ton of money off the data. That's easy, but it doesn't actually make anyone's life better. Guess which one the mainstream social players favor?
What I find depressing about LinkedIn is how much it has play-by-play replicated the old, broken way of doing things. Resumes. Titles and dates of employment. Recommendations. Recruiter spam. It feels like the Wayback Machine took us to 1995.