Do you +1 your own content?
I have not noticed any side effects, just wondering how many other people do this with their own content. I think it is a good idea also because you are claiming rights to your work.
Matt Cutts posted a video saying that if Site A got indexed every hour, and Site B got indexed every 24 hours, then it would be possible for Site B to list a really good article, and for Site A to copy it on their site and get indexed and credited for the work.
I think +1 your own content protects that from happening. Not main reason I do it, just saying.
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