Yeah, this threw me too. Salad Fingers is absolutely pre-YouTube. I remember watching that, Weebl and Bob, Charlie the Unicorn etc etc, all as Flash videos.
Salad fingers and weebl and bob were both on weebl's stuff AFAIK http://weebls-stuff.com/ back in the day but got put on to youtube so that he could reach a wider audience. (and with the downfall of flash player).
Edit: Reading up about it, salad fingers had a different author
'Badger! Badger! Badger!', scampi, magical trevor etc. were also from there. It was a favourite site of my friend group when we wer 12 and spent lunchtime in the computer lab at school.
Those were excellent. Such was their popularity that their (badgers, Weebl) creator was invited for a presentation at the Holywell Music Rooms in Oxford; I can't remember exactly when but it must have been 20 years ago. This was fairly well attended (including the entire bioinformatics group from my institute).
Edit: Reading up about it, salad fingers had a different author
'Badger! Badger! Badger!', scampi, magical trevor etc. were also from there. It was a favourite site of my friend group when we wer 12 and spent lunchtime in the computer lab at school.