MessagesWebScript.java has code to load a hard-coded image file from http://www.alfresco.com for no apparent reason. In fact, the image file exists on the alfresco servers…but the image is basically nothing. That is, it has a valid png header, but nothing is displayed by the contents.
I can think of some possible reasons this code is choosing to load a blank image from the alfresco servers (not the installation, but the alfresco corporate web servers), but I can't think of any really good ones. And the comments in the java header indicates: "WebScript responsible for returning a JavaScript response containing a JavaScript associative array of all I18N messages name/key pairs installed on the web-tier." Why would that need to fetch a tiny, blank image-file from alfresco.com?
Hits on the image help us track the usage of Community throughout the known interwebs. There's technically nothing stopping you blocking it since it is a free Community install after all.