LinkedIn, being a social media-type vehicle, can be one-on-one, but in the short experience that I've seen with the program, one person has a question and multiple people have answers and advice.
While it can facilitate that one-on-one, what I've seen is that there's advice coming from all corners of the country to specific questions. I wouldn't say it's one-on-one mentoring. I think it takes advantage of the network and the breadth of the membership that is connected to the group to provide solutions and advice to people who have queries.