It's kinda unclear at the moment, but it's working its way through the courts! See HiQ Labs v. LinkedIn [1] in which HiQ was scraping public profiles and was blocked from doing so by LinkedIn. This made its way to court and the 9th circuit ruled they were allowed to scrape but SCOTUS later rejected the decision and sent it back. So—murky!
[1] https://en.wikipedia.org/wiki/HiQ_Labs_v._LinkedIn
