This is the KEY to embeds. There are at least two kinds of embeds:
* Embeds of content supportive of what a blogger or website is discussing on a particular page now.
* Embeds of content as an active source of curation and new related content.
Slideshare tends to get embeds from the first group - people who want to support what they are working on now.
If my Storytelling Is The New SEO Slideshare doesn't update that's probably okay since the 58 embeds were using my slides to make a point:slideshare.net/martinmartysmith/storytelling-new-seo
If I had a ScentTrail Marketing or Curagmai widget and it stayed static that would be a problem since those who've embedded a Twitter or blog role widget expect NEW content to stream to them frequently.
Widget users use our content creation as a source of new content. We are glad to help since we receive awareness and a valuable source of new traffic and input into our "widget network".