LinkedIn's publishing platform, which started as a small experiment available to just the "influencers" the professional network deemed worthy, is now available to millions of its members.See also: LinkedIn Has Quietly Rolled Out A "Follow" Button To Millions Of UsersRoughly 15 million people now have access to LinkedIn’s publishing tools, the company stated in its second-quarter earnings press release on Thursday.With LinkedIn’s publishing platform, anyone can share their professional expertise in a long-form post, and anyone can follow you and read it.