Suppose I get a detailed review and implement many things in response. Where do I reply to say what I did? Presumably, reviewers want to know that their suggestions were useful.
If I implement suggestions from a review, where do I reply to say what I did / thank the reviewer?
1\$\begingroup\$ Not an answer, but an upvote, possibly accept and following there suggestions are nice, :) \$\endgroup\$– Peilonrayz ModAug 6, 2016 at 20:30
3\$\begingroup\$ The comments are useful for this. \$\endgroup\$– user34073Aug 6, 2016 at 20:37
1\$\begingroup\$ If you want the revised code to be reviewed again, you may post a follow-up question (and link to the original post); if you just want to say "thanks", then give an upvote, a checkmark, or even a bounty. CR isn't a discussion forum, we're about the reviewing itself, not about the result of it - so the "final code" has little or no value on the site, really (is code ever "final" anyway?). \$\endgroup\$– Mathieu GuindonAug 6, 2016 at 21:16
3\$\begingroup\$ See also What to do when someone answers for possible options. \$\endgroup\$– Martin RAug 6, 2016 at 21:17
\$\begingroup\$ FWIW I saw your question in the hot network questions list in the side bar - that should help with getting more eyes (/votes) on the answer you got =) \$\endgroup\$– Mathieu GuindonAug 6, 2016 at 22:21
Presumably, reviewers want to know that their suggestions were useful.
Indeed! As with all Stack Exchange sites, useful answers receive upvotes from readers. If you haven't done that already, give that review your upvote, and mark your question as answered by giving a checkmark to that awesome answer. If you have >50 rep and more to say than just "Thanks!" or "Awesome, +1!", you can leave a comment too, though these comments often get flagged (and soon removed) as too chatty or obsolete.
Sometimes a question doesn't get many views, and still gets awesome answers, but then these answers don't get as many views as some others (say, on some more popular question) do, and you feel like your petty +25 doesn't do justice to the awesome answer you got. Browsing to the answerer's profile to upvote all their answers is not the solution - serial voting gets automatically reversed, so voting for users isn't a good idea.
If you have the rep, you can award a bounty to a specific answer, specifically to reward the reviewer with additional rep from your own stash.
Code is never really flawless though, so you might also want to follow-up with a new question (it's rather commonly done here) - see this Help Center page for all the relevant information.