Here's the October 2021 announcement for this Lightning Address feature going live:
SN release: lightning address support #3191
UPDATE
Stacker News now supports withdrawing to a Lightning address.
And here's another list of services that may support Lightning address:
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Just saw a net way to identify a Lightning address as being a Lightning Address:
Cointastical@Stacker.News
The "⚡" before the nym helps to differentiate it from being an e-mail addres.
This was shown in a Tweet by Alby, and can be seen from this post here on SN: #15009
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