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Firstly you should generate the social button codes, from each networks relevant dev sites (facebook like, g+ button, twitter etc.).
Try to use the same style of button, I use the box_count style in general.
I then create a static block (include this where I need to) and add the various social button code into the static block in Magento cms. I wrap each social button in a div and float them left so that they sit next to each other, then add any further css for margins etc.