WordPress Tweak and Google fail

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
-When I post my Wordpress website to Facebook, random pictures from my website show up for the "thumbs." I want to be able to choose the thumb that represents the site.
-Google grabbed the wrong picture from my website to feature on "books.google.com" - for my book cover. How to change?

Skills required:
Google App Engine, Wordpress
About the employer:
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