When you do a rep recalc, that should update effected users' profiles to show rep before, rep after, and the time of the recalc on the profile page.
closed as too localized by random Jun 22 '12 at 16:08
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I don't find that particularly useful. 'Rep before' doesn't exist anymore after the recalc. 'Rep after' is shown in the profile anyway.
What might be useful is letting people know a recalc has been made on their accounts only, probably in the Recent tab, if only to reduce the surprise.
For a general recalc I think a notice on the blog would occur so again, no need to.