The sale of liquor flowed on social media sites on Good Friday, despite Easter trading bans and liquor licensing laws.

Drinkers determined to flout the Easter alcohol sales ban are using Facebook to get their fix.

Members of Facebook second-hand sales groups were using the forum to proffer alcoholic wares on Friday, when the sale or supply of alcohol by on and off-licence retailers is banned under the Sale and Supply of Alcohol Act.

The same Act requires alcohol retailers to have one of four licences to sell alcohol.

Stuff is aware of at least five members of the Christchurch Buy, Sell, Exchange group asking other members to make offers on alcoholic beverages, posting photographs of their collections on the page.

Other members used the page to solicit offers.

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On Friday night, an Otago Flatting Goods page administrator posted a reminder to group members that it was illegal to sell alcohol on the page."

"I know its hard to get booze on easter, but it won't kill you to go dry for a few days!" she wrote.

The administrator added those attempting to do so would be permanently banned without warning.

A Southern Police spokesman said he had not been made aware of the practice until contacted by Stuff on Saturday morning.

The Act also bans alcohol sales on Easter Sunday and Christmas Day, and Anzac Day before 1pm.