This user has posted the same answer on four different SO questions, all linking to a certain project's website.
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For me it definitely is:
Yes, because of the lack of content or any apparent direct relation to the question... I feel these cross the line as spam.
There are a lot of definitions of spam. In cases like these, I think the deciding factor is, are these messages being "posted indiscriminately?" "Indiscriminately" as in posted either mindlessly, undirected, or in a somewhat random manner.
There are cases where a user's otherwise perfectly legitimate answers also happen to include self-promotion. I don't necessarily consider those spam on that basis. You have to look at the context.
These do not pass my personal acid test.
I'd like to thank you for using up four of my spam votes for today. :)
My acid test is:
Thus, they reek of a canned meat-based product.