On: Dwitter – A social network for short JavaScript de...

[andrew3726]

Yup, as confirmed by the author[0]. Also, it's opensource, 'dweet card' template shows that it uses iframes[1].

[0] https://news.ycombinator.com/item?id=13702021

[1] https://github.com/lionleaf/dwitter/blob/master/dwitter/temp...