FYI - If you have a Facebook page, rules will change in January 2015.
"Change in Facebook Pages Rules will affect artists marketing their art
There's a major change coming for those who use Facebook to promote their art. Facebook
is changing the rules and changing the way specific types of posts will
show up in the news feed. I'm certainly going to be having a rethink of
how I promote other people via my Facebook Page. This is a
RECOMMENDED READfor all those who have a Facebook Page and use it to market their art and/or exhibitions."