I know its pretty annoying to see anything popping out of website but still Facebook pop-up like box is good way to increase your Facebook page likes. There are two different ways to add it in your website, one is to hardcode way which takes little effort and other one is easier which you can do by installing simple widget.
HardCode Way –
You can add following code to your
Easier Widget Way
Easier way is to install any of these widgets in your wordpress website –
If you are using any other way then please do let us know.