Bradbury said that in 2008 there was an agreement in the blogosphere that that the rule was sacrosanct, but Slater said the commission's stance was farcical.
"I will not be blogging anything about politics on election day but I am going to leave my comments open. I am not going so far as the commission says in moderating the opinions of other people because I don't see why I should be responsible for other people," he said. "The commission have shown themselves to be toothless ... the chances of being prosecuted are always remote."
Canterbury University senior lecturer of communication and media, Donald Matheson, said the rules should be limited to people and institutions linked to political parties and activists.
Owners of websites have been reminded that they are responsible for keeping an eye on communication.
Social media consultant Michael Carney said there was limited room for monitoring but the guidelines were still useful.
"They cannot close their eyes to the fact that people are commenting on their sites," Carney said.
Up to this week the commission has referred nine matters to the police relating to this year's general election, though not all refer to media coverage.
THE RULES
* Electoral Commission guidelines say it is an offence, at any time on election day before the close of the poll at 7pm, to publish any statement intended or likely to influence any elector's candidate, party or referendum vote.
* "The Electoral Commission's advice to people using social media is not to post messages on election day that could breach these rules.
* "The prohibition of advertising on polling day enjoys strong public support, and significant breaches are likely to generate complaints," the commission said.