Thanks for the comments!
@ Ipmikov - I'm with you on writing engaging content. I understand the need for a call to action and maybe if they liked the content in that post they will like other posts and the content would be valuable. Extra push to click the 'like'?! I don't know if people would be influenced by this though or what their engagement would be like with other posts - some observation would be able to give a better indicator.
@jarreau - Good point! I didn't really consider the 'talking about' metric. It would be interesting to see how many people use that as an indicator of popularity... I was just a bit awestruck about the strategy being to secure more 'likes' but you do make a great point. Thanks