Here are links to the primary social media wizards that allow you to make a custom share/like icon for your website

Look for a future article on the pros and cons of pointing your social media likes/+1′s towards your URL or your Facbook.com/company & plus.google.com/+company

Create a Facebook like button
https://developers.facebook.com/docs/plugins/like-button

Create a Twitter follow button
https://about.twitter.com/resources/buttons#follow

Create a +1 Google plus button
https://developers.google.com/+/web/+1button

Create a Pin It Pinterest button
http://business.pinterest.com/widget-builder

Create LinkedIn plugins / Profile Badges
https://developer.linkedin.com/plugins
http://www.linkedin.com/profile/profile-badges

Create a Tumblr button
http://www.tumblr.com/buttons