LONDON, Ont. -- Andrew Campbell started the new year by sharing the day-to-day events on his Middlesex, Ont., dairy farm with his 13,000 followers on Twitter.

Then the hijackers moved in.

Outraged at Campbell's project to share the positive news from his agricultural operation and teach what life is like in agriculture, vegan groups from around the globe and individuals opposed to the livestock industry moved to swamp his tweets that used the hashtag #Farm365.

Along with tweets decrying the use of animals for food, there was a steady stream of photos of dead livestock and animals being put down.

In some postings, farmers were called murderers for sending animals to slaughter and rapists for having their livestock artificially inseminated.

Many suggested it was immoral for farmers to use "non-human animals."

Farmers and supporters of Campbell fired back on Twitter, defending agricultural practices and the compassion of producers.

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Vegan groups launch Twitter attack on Ont. dairy farmer