how do you embed flickr photos into threads?
Go to the Flickr page of the image you want.
To comply with Flickr's terms and conditions you need to post a link to that page ( a silly rule IMO, but it won't kill anyone to do it ).
To embed the image you can go to the "View All Sizes" option under "Actions" and choose the image size you want from the page that displays. Now copy the download link for that size and you just use the Insert "Image From Web" icon on DPR's post edit toobar to embed it.
Like this :