Digg has clamped down on a new service which claims to allow publishers to manipulate ratings on the social bookmarking site.

The offending site, User/Submitter, describes itself as an opportunity for Digg users to “make easy money” by promoting articles, while charging publishers a fee for the privilege.

However, a statement on the site says it had been forced to rework its system after being discovered by Digg during trials.

It says: “Digg has recently been disabling user accounts that have shown obvious patterns of using User/Submitter. At this time, please wait to use User/Submitter until we rework the system to help users avoid getting disabled by Digg.

We should be rolling out this new version of User/Submitter in a few days.

Have a read of Ashley’s blog in August for our thoughts on the pluses and minuses of using Digg to expand the reach of your content.

Search Engine Roundtable also recently raised the issue of how Digg can boost traffic but not ad click-throughs.