Karma fraud

[Overgrow]

I received a question in email asking if my Karma system has any checks to prevent users from searching posts and clicking their friends repeatedly. Since this is a common occurance, the system has many methods set up to eliminate fraud and karma boosting manipulation. Here's the security that should be in place for a Karma system:

Email inquiry:

> Does your script limit this in any way or control the karma from being
> abused?

Here are the checks that are in my script (all options are Cpanel
controlled):

-User cannot give more than X number of karma hits per 24 hours.
-User must hit X number of people before they can hit the same person again.
On a large site, I have this set at 20 or more.. meaning they must hit 20
different people before hitting their friend again.

There are a number of qualifications a user must meet before their karma
hits count at all. This is to prevent people from registering new handles
just to pump up their own karma. It also makes real new members learn about
the system before participating. Those restrictions are:

-User must have X number of posts before karma counts.
-User must have at least X positive karma themselves or their karma clicks
don't count. I set this to a little bit above the starting level so the
person must have proven to be a good poster before their karma clicks
matter.

You can also turn off each person's karma ability in the Admin Cpanel, user
by user, and you can specify a "Suckers" user group of annoying people that
can never give karma. I've also recently added a check for my version 1.12
that prevents Karma Sniping-- people would turn their own karma off (saying
they didn't want to participate)-- but then turn it on for a few seconds to
hit other with negative clicks before turning theirs back off again. This is
now stopped. I've also added javascript form protection that prevents
double-clicking and other tricks meant to add duplicate records.