You should put up a number of ads to split test to see which does better. No more than two at a time, because FB's split testing beyond that gets wonky. If you proceed a small step at a time with the split testing, you can get the like cost down to literally nothing. I was down to 0.01-0.02 a like at one point.
Look up Jerry Banfield's YouTube videos on FB . He does some crazy stuff that will blow your like campaigns away. They are hardcore, however, but they'll give you some out of the box ideas.
Try to find out the peak time when your targeted audience engaged on Facebook. Create attractive images and videos; this really works in increasing Facebook likes.
According to my personal experience funny and amazing videos helps to increase Likes and popularity of Facebook page.
Try to maintain your posting frequency so your page get more engaged.
I went ahead and conducted a small experiment to see if I can increase likes for a Facebook Page that covered major events happening in India. After 4 weeks of A/B testing and working with various tools, I got to 10,000 likes for my Facebook page. And because I was able to do it with no prior experience, I wanted to share with you the 5 steps that got me to the 10K mark:
You can go on this link for more detail:-
Install lightbox facebook fan page
Feature of This lightbox facebook fan page:
Every one see your facebook page.
Every time when page load this popup shows.
Increase fan page likes.
Promotion of your fb fan page.
this is aswesome method to get more like from your blog/site:
http://www.computertrickstips.com/facebo...
You can find online like increasing tools. Where you can get 100 or above likes per day.
http://aaditritechnology.com/
www.addmefast.com try it