How to Beat Wikipedia from Top Spot

I want to target a keyword with medium competition and Wikipedia is taking the top 3 spots in google...

How difficult is to overtake Wikipedia?

Any advice will be greatly appreciated

Very difficult. If your sneaky, you can add in your link at the bottom of the article though.

They have a lot of authority and almost perfect internal linking structure. You might be able to create a fan page and get it ranked with some good likes, shares, bookmarks, etc. The bottom line is without site authority, you won't have much of a chance in Google.