When I see a post that includes the words "Like if you ..." or "Share if you ..." the last thing in the world I want to do is like or share. Not only do I not like the suggestion of chain letters inherent in such exhortations, but the posts themselves are often pointless.
For example, one of my Facebook connections put up the following picture post:

Really, this is beyond absurd. Why not then have "Like if you wish AIDs/stroke/dementia/asthma/diabetes/tuberculosis/malaria/
didn't exist." In fact, you can put in "Like if you wish flat tires didn't exist" or "Like if you wish blackouts (especially during Super Bowls) didn't exist."
Another Facebook connection put up the following, including the odd capitalization, shift from noun to adjective in "spousal" and use of "anytime" when "anything" was likely the word intended:
Abuse of anytime is Despicable - Animal , child or spousal

In other words, if I don't re-post that chain letter in a jpg, I prove I don't have a heart. Very intelligent way to promote your cause. And just how will spreading this post help protect any child, spouse, or animal from abuse?
I see examples like these as social media at its worst in terms of equating a share with real care. People believe they are doing something for a worthy cause when, in fact, their actions do nothing to improve the situation. Liking and sharing does not contribute to safety, prevention, or research. It just allows people to show that they consider themselves sensitive and caring individuals with nothing more than a click.