feel free to add me as well - thanks :) http://www.linkedin.com/in/robertkist And yes, it pays to be on linkedin. Facebook for pro's or not, HR people definitely search there to find people and contact them. Happened to me a few times already. Also there's job postings in the various groups on some HR people even put open…
I think it's a good website for networking. My friends and I have been able to contact various people from different companies and start up small talk and get a lot of good info on their experiences in the industry. There are a lot of HR reps on that site too typically looking for employees.
I feel it would be alright, considering it would only be one additional line and would take up minimal space. Most industries are all moving towards the internet anyways, so I couldn't see how the game art industry HR reps would be turned off by the link. I'm sure most of them have profiles there themselves :p