We check this website, now salsalabs.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is salsalabs Down Right Now? - NO! salsalabs is up!
If you have problem with access to site salsalabs, and domain salsalabs.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).