During the winter I attended a Social Media and Online Marketing Course that was run by the Limerick City Enterprise Board.
I see that they are running the course again in March and in May. I would recommend the course to anyone who is running a business and who wants to get more familiar with the area of Facebook, Twitter etc.
I found the course informative and met some interesting people. The link to the upcoming course is here http://www.limceb.ie/index.php?subID=86#On_line_Courses