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Shouldn't Goodreads and Twitch be on that list?
That would explain why that have Amazon links to movies but not Netflix. Unfortunate :/
Probably Slashdot. Can't recall when I started going there, but I know it's been at least a decade
Until a couple of years ago that would have also been my answer, but after the sourceforge started to include malware in their installers I stopped going to all DHI sites.
Metafilter?! Is that really still going?!
I occasionally still visit the Bethesda forums. They've been around since about the time of Daggerfall, but I've only had an account there since '07.
The wayback machine? https://archive.org/
COME ON AND SLAM (Yes I do, regularly).
The...the...THE LINK'S BROKEN MAN!
Badastronomy.com which is now a Slate blog. NOAA.GOV which is where I get my weather reports.
Hm, someone already said Google. I guess the runner-up would be Wikipedia (created in January of 2001).
Probably Slashdot and BluesNews for me.
The oldest period I regularly visit is, as gladsdotter said, IMDb.com. The oldest I regularly visit in that I've regularly visited it since the earliest days are probably Something Awful and MOCPages.com (a LEGO custom creations website), both of which I've been on regularly since the early 2000s.
Slashdot, Founded 1997. I haven't been going on there to long though.