Good explanation. I don&#x27;t know if it&#x27;d be worthwhile to track logged-out users though.<p>Lumping it in with the same data that came from the last logged-in user would make the data less valuable, because there&#x27;s far less of a guarantee of which user the data was collected from (imagine people using Facebook on a library computer, then logging out and 20 more people using the computer before someone else logs in).<p>I&#x27;m sure there&#x27;d be some use for the data though, so I&#x27;m sure Facebook will gather it if they don&#x27;t already have plans to. They could just earmark it with the probability that it applies to the given user.<p>Or just lump it all together as anonymous data, I&#x27;m sure there&#x27;s value in that too.