I thought lightning network is just a concept, until I saw this recently:
https://segwit.org/my-vision-for-segwit-and-lightning-networks-on-litecoin-and-bitcoin-cf95a7ab656b

Hi there,

I accidentally put an email instead of username as my Slack username in the spreadsheet. (Line #866).
Please spare a moment to change it to gayanw.

Thanks.