Not receiving pingbacks or trackbacks

I’ve set up 3 wordpress blog, each with a different theme, and none of them are receiving pingbacks or trackbacks. Neither appears in the comments section nor in the comment moderation in the wp-admin panel. Regular comments work fine.

I’ve gotten a number of links from other blogs, and have linked between the blogs (and within them) and nothing is producing pingbacks or trackback.

My blogs are at: moneytimeblog.com, ivorytowerunlocked.com and lawnchickens.com