Just like the subscriptions used to be. The same rules would apply, i.e. those with privacy settings enabled would have their saved searches hidden.
Break each down by grouping, and then combine all saved searches via some type of separation pattern, i.e. "(SAVED_SEARCH_1), (SAVES_SEARCH_2)".
Example:
Copyrights:
(~girls_und_panzer ~kantai_collection), (touhou), (~splatoon ~legend_of_zelda)
Artiststoupload:
(~abenattou ~nullken), (haruhata_mutsuki)
The above would allow those that want to share the tags they like with others.
Thoughts?