Hello @glennfriesen, the best way to tell is to use Greasemonkey and the nofollow display greasemonkey script which highlights in pink any rel="nofollow markup. Some javascripts might obscure this nofollow checking but it generally works most of the time.

Great. Do you know if link juice is passed through the hyperlinks in DocStoc's embedded documents?

Link building, if done properly, will drive a huge amount of traffic to a website and the result is mostly positive. A competitive link building campaign must first be considered and hiring link builders is recommended. Link building is now one of the best techniques in seo that helps an online business or service.