Oh I see where this confusion came from @tobiaseigen wants:
http://site.com/latest?user_is_watching=bob
I think this is far to uncommon to add. For diagnostics I would recommend data explorer. @maja can you:
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Add a stock query to data explorer to view list of topics a user is watching.
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Don’t render the “Show tracked topics” etc links IF you are viewing a profile that is not yours.