Hi Yula,
It's basically a splog.
WordPress.com has a huge pagerank and if you have a blog on that domain, it's like having a chunk of that website's history and duration online.
What the splogger does, after signing up for the new blog, is comment spam others. The messages show up, with a live link, on the unprotected blogs and that helps to build the backlinks to that one splog. This will only work for the short term, though, and the splog will be dropped from the search engines.
In other words, sploggers are trying to turn WP.com into the new blogger.com in terms of building spam sites for a quick buck.
~ Teli
P.S. WordPress.com users can report blatant splogs (like the one mentioned above) and the WP.com team will take it down fairly quickly.
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