I'd like to set it up as a subscription service like Domaintools. I'm also crawling and storing user's comments, friends, posts and links to media published in

I'd like to set it up as a subscription service like Domaintools. I'm also crawling and storing user's comments, friends, posts and links to media published in other groups. It will make a great tool for profiling a person, but I'm not sure on how (il)legal it will be.