Just follow the instructions as it appears on the following screenshots:

• Goto the facebook page which you want to promote.
• Click on Invite friends to like this Page.
  
  
• Scroll down till the dynamic loading stops.
• Open the developer console by pressing the F12 key on the keyboard.
  
• Paste the following code in the console.

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var inputs = document.getElementsByClassName('_1sm');
// class name of the invite button
for(var i=0;i<inputs.length;i++) {
// click on the focused element
inputs[i].click();
}

• Wait for the request to complete.
  

• It might take some time depending on the number of friends and the speed of the internet connection that you have.
  

• All done! Share your joy by clicking on the share button below.