Ways to Promote Facebook Page

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I need information and/or techniques on how to promote a Facebook page!

 

Through my research I have come across only two ways, either pay for advertising or commenting on other pages.

 

I am thinking about the commenting on other pages, using Facebook as my own page, is this a good technique?

 

Please also provide me with any other ways that you personally have discovered work well in promotion of a Facebook page.

 

Much Thanks,

 

BiologyWebmaster