Flickr's logo in black and white is simply 2 circles with different opacity. I'm wondering if that will suffice.

That or I make it a double icon like PayPal requires... #297.
IMHO there are a several options you could do:

I'd go for just the two circles (either both filled black or one filled black and one empty/white with a black contour), but I'm not sure which variant would fit better with the other icons.
A rough idea of how it will work in PayPal and Flickr. This won't go in until the next Webfont though, so I'll keep the issue open until then.
.mdi-test::before {
content: "\f---";
}
.mdi-test::after {
content: "\f---";
opacity: 0.6;
position: absolute;
left: 0;
}
<i class="mdi-flickr"></i>

(PayPal uses after: opacity = 0.8; before: opacity = 0.6)
looks very nice :) I'll look forward to the next release then!
2 circles knocked out of the square would do the job, similar to FontAwesome: http://fortawesome.github.io/Font-Awesome/icon/flickr/
Ah, I was hoping we already had this icon. Now what?
Cheeky bump! ;)
I'd like to see this as well.
I revise my vote that we use the 2 circles on their own, it's what Flickr use for their favicon and it's also what Simple Icons use (they're pretty strict on adhering to brand guidelines).
Just downloaded the webfont v3.2.89 from the website, but it still doesn't include the Flickr icon. Is there any extra step?
@minimaluminium, this icon will be available in the next release, coming soon. You can use the history page to track the changes since the last release.
Most helpful comment
2 circles knocked out of the square would do the job, similar to FontAwesome: http://fortawesome.github.io/Font-Awesome/icon/flickr/