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Probably special code so that karma you give shows up immediately, that way people don't think it doesn't work. My guess is the delay is shown for everyone else.

This is likely part of a bigger effort to obfuscate karma to avoid spammers exploiting it to appear "liked". Spammer X makes account Y and Z. He makes account Y like Z. On account Y it shows, but not on Z. Spammer then thinks he can't exploit it.

Just a thought.

One must never question the meanings or methods of karma.

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It is the only way to escape samsara.

All of the above....;)

It'll be a local cookie vs. database update time delay issue...;)

Unless, of course, you know how to accelerate your karma past the speed of light.  Sometimes I get next weeks karma last week.

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MMMMM, chocolate chip!