I used he same technique for several for my sites and clients sites to gain PR and it works.
1. Ping Urls's with Pingdevice.com
2. Go to Bulkping.com and create a RSS feed
3. use Pingdevice.com again to ping the RSS feed
4. use Pingomatic.com to ping the RSS link
5. then use the http://www.imtalk.org/cmps_index.php?pageid=IMT-Website-Submitter to ping it.
They are probably already indexed, so once Google recrawls the pages you should get appropriate credit for the backlink. I wouldn't ping them but that's just me.
If you were talking about profile links or something, that may be a different story. But Google can compare discovery of new links on a page with how that page was found. Spread that across 30 blogs, it would not be hard for Google to algorithmically determine which link owner is responsible for all the pings. This may raise suspicion or even temporarily devalue those links.
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