As someone who has done a lot of scraping in the past (sometimes for good, sometimes not), the number one thing you need to respect as a scraper is that email or phone call you get saying "Stop doing that."
In almost all instances, you're legally fine in the real world until you get some communication to stop and/or blacklisted. After that point, what you are doing becomes a crime.
- LinkedIn is not a public resource, it is a private company that pays for servers. - LinkedIn might scrape too, but that argument isn't going to hold up in court, and the scraping they do is probably in line with their EULA (protip: never install a social networking app on your phone, ever). - The analogy to the storefront, taking pictures in public, etc, all break down because scraping LinkedIn requires you to access their resources. - The analogy to browsing a store is great. If you are in a store, and they ask you to leave, and you don't, that's trespassing. Trespassing isn't legal.
The CFAA isn't a great law. There are a lot of gray areas. But LinkedIn seems within their rights here.
If anyone wants to know how this is going to wind up: https://www.eff.org/deeplinks/2015/06/padmapper-and-3taps-se...