When it's lifted, holus bolus, from another blog. I know it's not as serious as plagiarising for your uni essays but there is something quite sad and pathetic about nicking a post from somewhere else and putting it on your own blog with no attribution.
Think it doesn't happen?
And Sydney Life has just had its first experience of being plagiarised.
I did enjoy the fact that the post stolen included a tip for picking up plagiarism in Google...