Splitting this out from T49658#527202:
I just learned about [[Special:Log/thanks]] and think that this log should be expanded to include a link to the edit. So instead of:
11:26, June 3, 2013 Okeyes (WMF) (talk | contribs) thanked Foo (talk | contribs)
it would read:
11:26, June 3, 2013 Okeyes (WMF) (talk | contribs) thanked Foo (talk | contribs) for this edit
and the words "this edit" would link to the diff of the revision.
T56983: Add thanking to $wgRateLimits as emailuser, to avoid "thank nuking"
T57428: Remove all logging for the Thanks extension
T58818: UserProfile displays page that user was thanked on