Firstly, when I Googled this to find out what is already written about it it was a suggestion from Google which suggests that it's a hot topic. Does this indicate that people are aware of the Facebook guidelines and are simply ignoring them, or assuming that because everyone else seems to be doing it, then that simply makes it OK?
I was recently asked this question on Twitter by Gwawr of @Lolfa_Cynin
@nat_reynolds Hi Nat. I wondered what your opinion on the "like&share" competitions on Facebook was. - Gwawr :-)Where do I start?
— Lolfa Cynin (@Lolfa_Cynin) April 11, 2013