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Hmm, ok, my apologies, looking at the source code, it seems to only currently support embedding YouTube and Vimeo. It's open source, so i guess someone could fork the source and add more supported platforms, then submit the changes..

Screenshot_20180219-222946.jpg

Line 140-170 https://github.com/steemit/condenser/blob/master/src/app/components/cards/MarkdownViewer.jsx

Kinda strange to specify vimeo in the else statement, if they hadn't it would arguably embed anything you like, be that vimeo, d- tube or whatever?? As it just creates an iframe..

#confused :/

I took the liberty of making the code change to allow for D-Tube embedding, I have submitted the changes for approval, if all goes to plan, you should be able to embed D-Tube videos shortly...

https://github.com/WeeNeilster/condenser/pull/1/commits