What is the difference between 'Social Marketing' and 'Pay With A Like' Plugins?

I'm looking for a way to motivate visitors to take action on the site.

The 'Social Marketing' plugin and the 'Pay With A Like' plugin seem to do this.

So, can anyone point out any significant differences or advantages of one over the other?

Or am I mistaken...and they do two entirely different things...and both can be used side by side?

Thanks in advance.
David