Trademarks of web services
I would like to open a question which sums up requirements for customizing icons of web services. For example if you want to make your own Facebook icon and put it on your website, you should be sure that it is legal to do so and in which cases.

If this question will be interesting for you, find a popular service with link to a legal right usage of the logo and post it as an answer. Over time I would edit this question and add links to these services.

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[Facebook][1] - you have a permission to use the "f" logo but you cannot customize it without a written consent 





  [1]: http://www.facebook.com/brandpermissions/logos.php
Trademarks of web services
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I would like to open a question which sums up requirements for customizing icons of web services. For example if you want to make your own Facebook icon and put it on your website, you should be sure that it is legal to do so and in which cases.

If this question will be interesting for you, find a popular service with link to a legal right usage of the logo and post it as an answer. Over time I would edit this question and add links to these services.

-------------------------------

[Facebook][1] - you have a permission to use the "f" logo but you cannot customize it without a written consent 





  [1]: http://www.facebook.com/brandpermissions/logos.php