I am really a huge fan of this topic it fills me with a great sense of childlike wonder for how good the internet was!!
I spent so many years on habbo hotel I had a one name username (loraine). My gran would let me use her phone to get HC so I always looked super slick and had loads of furniture. Loved a day spent down in the furni trading rooms and playing games (falling furni the best one). I built so many rooms and I think my favourite project was a like ten room all inclusive holiday where rooms took you all the way through the airport, plane, then to a hotel on holiday. The creative aspect was so fun as well as just being able to be a pretend person. I remember I had a habbo boyfriend called evrule and he would buy me presents like trophies engraved with how much he loved me. Then one day I caught him hanging out with another habbo and calling her his girlfriend and I went into his rooms and moved all the furniture around so they looked bad as revenge hahahaha
Big shout out to: girlsgogames, stardoll, neopets, myscene, bin weevils, bebo, myspace, club penguin also. These websites allowed for so much creativity and imagination and they were FREE! Feel like this era of the internet really raised a generation of creatives who were able to adopt this new tool and just make it something actually magical. Like how was I teaching myself coding aged ten to try and make my cursor pink and learning how the neopets stock market worked???