The data doesn't seem to contain enough information to cluster unrelated URLs (e.g. by User Agent). Each record contains 1) a timestamp, 2) the requested URL,

The data doesn't seem to contain enough information to cluster unrelated URLs (e.g. by User Agent). Each record contains 1) a timestamp, 2) the requested URL, 3) the referring URL, 4) a boolean classification of the user agent (browser or bot), 5) a boolean flag for whether the request was generated inside or outside IU. Although you could reconstruct who's looking at Facebook from inside IU, it'd be difficult to further associate them with some other website like Hacker News. On the other hand, the timestamps do leak some information which could potentially be used to identify patterns of activity.