Hi guys. Just a question more to do with marketing than anything else. lately i have started receiving alot of pingback notifications from other sites in my industry for me to approve. When i click on the links they go through to a site that has duplicated my post and added there own links in plus a link to me. Should i approve these so they display on my site? and as this is the same content that i have posted is it worth much for SEO purposes if the other site is reasoanble for PR?

Much appreciated