The warning page used logos from both the Metropolitan Police and the Police Central Crime e-Crime Unit (PCEU) to make it look more like an official warning notice.
He said the three warning stages were a weed notice, a cultivation notice and finally a termination notice if no improvements were made after the first two requests.
BBC: Overgrown allotment warnings issued by Brighton council
Drummer Rigby's regiment, the Royal Fusiliers, also issued a notice to veterans and serving soldiers warning them about being associated with far-right groups.
That information results in a Notice to Airman (Notam) warning which is posted to a day-by-day database pilots can consult before they fly.
BBC: London helicopter crash: What are the rules for pilots?
"When the bridge is closed the council currently puts up a small sign and most drivers seem to take notice of that, so a warning is needed, " he said.
BBC: Dyfi Bridge: Snowdonia National Park road sign objection
Last month, the Swiss government issued a travel notice for India that included a warning about "increasing numbers of rapes and other sexual offenses" in the South Asian nation.
But an amended breach disclosure law might require sites to post a notice on a site itself, warning users that it had been compromised over a certain period of time.
Separately, the bank disclosed it received a Wells notice from the Securities and Exchange Commission, which is a warning civil charges may be coming, related to disclosures in its offering materials for mortgage-backed securities.
"We put a motor in the cheek pad of the helmet so if you do not notice the object it will vibrate and give you a tactile warning that there's something to the right or left, " said Mr Moore.
President Barack Obama's warning about Syria's unconventional weapons arsenal is one of those "sit up and take notice" moments.
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