How Much Time Does It Take To Do Social Media? (The question from the blog post of the same title and highlighted on Twitter by JHenning.) My answer: “More time than I have.”
How much time should you spend? Enough to read the industrial automation blogs via RSS. Twitter might be of some value if you are following a particular event and if the participants and/or attendees are using it.
If you are an automation supplier, I suggest you start blogging at a minimum, lest your customers start without you.