Users are not able to upload pictures to Facebook when using Web Security Services (WSS).
Something went wrong. We're working on getting this fixed as soon as we can. You may be able to try again".
Facebook uses the URL https://upload.facebook.com to upload pictures to facebook. The site is categorized as Media Sharing.
Site review can be found here: http://sitereview.bluecoat.com/sitereview.jsp#/?search=https%3A%2F%2Fupload.facebook.com
When "Media Sharing" is enabled, it blocks users to upload pictures to facebook. The setting can be found under "Service > Content Filtering > Policy > G3 > Blockec categotires > Multimedia > Media Sharing"