An exemplary computer-implemented method includes obtaining at least one teleportation invite block that records a virtual universe teleportation invite marked by at least one parameter. The teleportation invite identifies a virtual universe user as an invitee. Responsive to the parameter, assess whether the virtual universe teleportation invite is potentially malicious, and alert the invitee in case the virtual universe teleportation invite is potentially malicious. Another exemplary computer-implemented method includes obtaining at least one complaint block that records a complaint made against a virtual universe user; obtaining a plurality of traversal blocks that record virtual universe traversal events by the virtual universe user; identifying a pattern of harassment by analyzing a first plurality of traversal blocks that precede the complaint block; identifying a risk of future harassment by analyzing a second plurality of traversal blocks that follow the complaint block; and issuing an alert regarding the risk of future harassment.