For the full story: [Official Thread] Welcome back HTML Embeds! Goodbye to some sharing options.
The salient part is:
Secondly, we are announcing that we are deprecating the support for our built-in sharing options for WordPress [Ed: spelled in the original with a small "p"], Blogger and LiveJournal on 3/25. Deprecating features is never an easy decision, but we have seen that all of these services combined are now adding up to less than one percent of daily share volume from Flickr.
Which I understand to mean that this method will no longer be supported: http://en.support.wordpress.com/images/flickr-photos/#blogging-your-photos (link to Internet Archive)
Meantime, the flickr HTML embed option is being brought to the “new flickr experience” in addition to the current iframe embed, which we cannot use here on WordPress.com.
Of course, this does not affect the WP o-embed method of copying and pasting the link of the flickr image page on its own line in your post or page. Or at least I hope not!
(HTML embed from the original flickr experience coming soon to the “new flickr experience” near you.)
electricia1 posted in the Community support forums that flickr has changed the way images can be embedded. At the moment this is done with an iframe, which of course is a “no-go” for WordPress.com users.
However, there are other ways you can embed your flickr photos in your WordPress.com site, the easiest is still just copying the URL of the photo’s page from your browser’s address bar and pasting that on it’s own line, unlinked in your blog post. For more info here’s WordPress.com’s Support document on using flickr. Just be aware that if you are using the new Beta version of flickr, you may not be able to blog your photos directly from flickr to your WordPress.com site. In my photostream, that link is no longer active to me, although it was set up and working correctly in the previous version of flickr.
(And the irony is not lost on me that the flickr blog is hosted on WordPress.com. See the bottom of the blog. It may say “Powered by WordPress,” but the link reads http://www.wordpress.com. LOL)
Update: 20 December – It seems that either from the flickr or WPcom end things have changed. Yesterday the above oembed image was just an image. Today if you mouseover the image, the flickr watermark and my name show up, along with the ability to browse the other images in my flickr photostream directly from this image. I’m going to be doing some more experimenting in the coming days.
In the meantime, insert image by URL continues to work and unfortunately, my flickr sets which were previously visible as an embed, are no longer so. (sigh)
Update 2: 20 December – We can’t get our pants on fast enough with the changes going on. For me the above image is back to what it was yesterday, i.e. a simple image with no watermark or arrows on mouseover. If you are seeing it differently, please let me know in the comments.