For me interesting questions do not dead end. I always ask myself why? I'm a natural born scientist; or maybe I was dropped on my head at a very young age. In any case the "why question" never ends for me. I'm not very bright, as measured by my professional success, but I still exist so I'll continue to ask "why", "why anything." When asked a question which leads to the motivation for doing something my answer usually leads to "to save mankind from mass extinction" or some other very large and difficult problem to solve. Dogmatic answers don't cut it for me. In science there is no incontrovertibly truth, everything is suspect, and the questioning never ends.
The free sharing of information is helpful in solving large problems like "saving mankind from mass extinction". How freely we should share to solve this problem is not easy to solve:
We would have to have a mathematical model for the universe that we could vary all the parameters in the model that all humans have control over, define a derived measure of the parameters, and optimize the model over the derived measure. One of the parameters or a derived quantity from the parameters must be "How freely we should share." Clearly even a very low fidelity model is not easy to make. I'd expect that there could be some nonlinearities which could introduce local optimal solutions where information is restricted, but I'd also except that there would always be more optimal solutions that you could get to by simulated annealing or like method to get you over this bumpy model solution space. I'd expect that the most optimal solution would not include the sharing of this paragraph. Ha ha.So, since I can't solve the above problem in a reasonable amount of time, I'll punt and say information should be freely shared on the grounds of some kind of basic human rights thing. I grant you this is still vague.
Rank: LinkedIn and Facebook do not make it easy to put and access hyper links in the web pages that they generate. I don't think it's even possible to directly do that. That makes your LinkedIn and Facebook pages dead end links. Most company pages are dead end pages, that is there tends to be no links away from their web site. LinkedIn, Facebook and most companies are like self absorbed children that do not give and only take, with regard to hyperlinks. These web sites tend to be sinks of links and not sources. In some sense, I see them is being discourteous to all other web sites. I think it could be an interesting thing to study, how these kind of one-way graphs effect different measures. I'd guess Google and MicroSoft has studied some aspects of this. After my experiences with LinkedIn and Facebook I have become disgusted with web social media, they are making one way walls that keep you from connecting the web as I envision it. It's like the AOL experience all other again.
Another beef I have with most web social media web site is the lack of control the user has with his or her content. My solution to having control over my web content is to manage my own web server, and it's very inexpensive too.