FCC's whole point that net neutrality is stifling the progress of internet because cable companies are not able to make sufficient investments to augment the speed is flawed. Cable companies are open to compete with internet companies by building their products and services on top their own distribution network. It is simple forward integration and since they have tried and failed to do so , now they want artificially created disproportionate advantage to help them compete.
Lot of people do. My girlfriend has like 50 odd pinterest boards for everything from DIY ideas to cooking recipies. And I know couple of my designer friends use it to collect and organise their ideas. It definitly fills out a vaccum for visual interest based discovery. I also use it on decently regular basis and I like the fact that it is not overly social.
You can't really compare wallstreet and tech industry. One of the them just extracts commission through transactions of others while companies in tech do create some intrinsic value ( well some of them atleast)