Scroll down to the "Reception" section, it's in the first paragraph. It's hard to get the full effect from that paragraph though, as B^U became an automatically response to anything Buckley or C-A-D related for a long while. It was more of a textual social meme than an image macro'ed meme so it doesn't cast as long of a shadow today, but I'll always associate Tim with B^U first.
I'm not sure if it's still around, but one of my discord servers is determined to repeatedly resurrect the corpse of loss and parade it around. Usually what I see shared is a lot more subtle than this, though lol
Webcomic Ctrl Alt Delete. I think it still exists, but it's greatest cultural impact has been loss.jpg, in which the author tried to convey the tragedy of a miscarriage in the same four-panel format as the rest of his comedy strip.