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The Wikimedia Foundation’s present perspective on the Facebook issue can be found here. The following text is following this perspective:

Can I post photos produced by CEphoto, Uwe Aranas - which are licensed by CC-BY-SA - on Facebook?[edit]

No. If you are planning on reusing CC-BY-SA content produced by a third party (here: CEphoto, Uwe Aranas), you must comply with the terms of the CC-BY-SA license. Section 4 of the CC-BY-SA license provides:

The license granted in Section 3 above is expressly made subject to and limited by the following restrictions:
a. You may Distribute or Publicly Perform the Work only under the terms of this License.

If you post my images on Facebook, you are agreeing to their "Terms of Use" and you are licensing my images under those Terms. As by September 2014 the Section 2 of the "Facebook Terms of Use" provides:

For content that is covered by intellectual property rights, like photos and videos (IP content), you specifically give us the following permission, subject to your privacy and application settings: you grant us a non-exclusive, transferable, sub-licensable, royalty-free, worldwide license to use any IP content that you post on or in connection with Facebook (IP License). This IP License ends when you delete your IP content or your account unless your content has been shared with others, and they have not deleted it.

So, by licensing another party's CC-BY-SA content under "Facebook's Terms of Use" rather than the terms of the CC-BY-SA license, you are in violation of the CC-BY-SA license. Additionally, it's arguable that you are also in violation of FB's terms of use for representing that "You own all of the content and information you post on Facebook..."