Facebook Like Button vector
Terms of usage (From Facebook.com)
We permit the Facebook Like Button logo to be used in connection with the Like button social plugin, which enables users to make connections to your pages and share content back to their friends on Facebook with one click.
We also permit use of the Facebook Like Button in offline advertising (e.g., print advertising) to reference and direct people to your Facebook Page or your website that has the Like Button social plugin implemented.
We do not allow the use of the Like Button logo in online advertising. Please see the Usage section below for more information. Use of the Facebook Like Button is subject to the general guidelines listed above in addition to the following terms: 1.
The Like Button may only be used online for the Like Button social plugin functionality which can be found here on our developer site. 2. When using the Like Button in traditional offline media (such as print ads), a textual or visual reference must be made to Facebook. 3. While you may scale the size to suit your needs, you may not modify the Like Button in any other way (such as by changing the design). 4. Do not use the Like Button for online advertising. 5. All use of an unmodified Like Button is acceptable in offline communications.