Hi Q
I found your "Simple modification of wordpress plugin" project and I am very interested in this one.
My name is Tuan, as a wordpress developer, I can handle this job for you. I can use some code to custom this plugin, so we can have facebook like button. You can have a look at my profile, I am a freelancer with very good reputation, I received only very good feedbacks from cliets I worked with.
Please contact and give me more information, so we can go further.
Thank you for your time and consideration.
Tuan Hoang