Posted on the Sugar Labs wiki, http://wiki.sugarlabs.org/go/Request_New_Features#Change_default_Mesh_settings_for_greater_security ,
Change default Mesh settings for greater security We were very excited to try Sugar on a Stick (Mirabelle). However, I was very surprised to find lots of users with whom I could "make friends," some of whom seemed to have included their real names! It took some digging in this Wiki to find out that I just had to delete the Mesh entry (i.e., the reference to jabber.sugarlabs.org) so that only Sugar users on our Wi-Fi would show up. There may be a genuine security concern here. We simply have no way of knowing who the other users are with whom a child can "make friends." All it would take is for one bad thing to happen for the Sugar project to suffer. While we love the idea of children from all over the world collaborating on-line, perhaps pragmatic concerns about the security of all children should lead us, at the very least, to have the default setting on the Mesh entry as a blank. Parents and teachers will then be responsible for enabling this feature, if they so wish.
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