I beg to differ with you.  People have actually been using social media since before phones were installed in insurance agencies.  I would actually suggest that the written letter (by hand, typewriter, word processor or computer) could also be considered social media.  In these “old fashioned” communications, while business was being conducted, relationships were also being built.  Many of those letters and phone calls included some personal interaction along with the business communication.  The next step up from the phone and letters were teletype communications, then along came faxes and emails.