Just over a month ago, I was having a laugh with two male employees in the lunchroom and made a stupid joke. I had a banana on the table in front of me, I stood next to the table so the banana was "in front" of me and pretended to yawn (I know it was silly, the other employes were making jokes about the bananas on the table). Another male employee took a photo of me in this pose on his phone and later posted it on Facebook, even though he was told that it "better not end up on Facebook". My employer said it was a breach of its social media policies, and gave me a final warning. I used the word "slut" (again while joking around with another male employee), they said because I had received a final warning for the photo they are now terminating my employment. I don't excuse my behaviour. I was just trying to have a laugh, but can I be held responsible for someone taking a photo of me and posting it on their Facebook account? I don't believe I breached any social media policies. Would I have an unfair dismissal claim?