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I searched the forum and I don't think this has been mentioned before.

Basically I'm talking about:

• An extra section under recent activity. Possibly only for yourself, possibly public.
• An extra search option in the advanced search dialog.

Perhaps this should be personal-only, but on this forum in particular it would be very helpful to be able to search for something like

Search for: "bookmark" (or whatever)
By user: Spuds or emanuele
Options: liked by me

You can see your own likes, given and received, in profile - > show likes (index.php?action=profile;area=showlikes)  but you cannot search messages you liked. 
In elkarte 1.1 there is a new feature like stats, you can see it here in action : Community -> Like stats 
Not exactly what you are asking... 

Huh, so there is, but really my main point is the search. It do think it's oddly separated from the other activity lists and in a less useful format (i.e., subjects instead of whole posts).