No.

If it was that easy you could demolish your competition fast.

This kind of thing happens with blogs a lot, Google knows it.

i too wondered this as i posted a comment with a backlink on just one blog and got 320+ backlinks lol did nothing for me though

I wouldn't complain but I don't think they will last, it is most likely a sidebar link (which would show up in every page) which they have the latest comments but it could be knocked off with fresher posts.

Peter

No, it won't hurt your ranking. Google is aware and takes this into account.

After writing a new article and then submitting that to a few top rated directories, your contents would get picked by other sites admins and this way, the same contents would be copied and pasted across the net and within a few days, tens of links might be gained but after a while as you check Google most of them might be gone.

Gaining so many links from articles submitted is not a bad sign for SEO outcomes on the net since these links will not seem so powerful either. Google knows that contents might get picked by webmasters who have found informative sites and there won't be any problems.

This happened to me once (a month or two ago) and it has not hurt my Google ranking at all, to my knowledge. So from experience I can tell you it won't get you de-indexed or anything.