I posted a blog about this, thought I'd throw it in forums too. This isn't my main account, I'm slightly worried about what might happen if I suggest another site on my other account, as I don't want to get banned or anything (I could be overthinking).
I know about a few old revival sites, specifically Spacehey and Friendproject.
I really like Spacehey, but my only issue is that a bunch of my friends got booted off because it's no long available in their region.
So, I was scrolling through Reddit, looking at some nostalgic subreddits. I found a screenshot that came from ribbitchat.com. It doesn't seem to be a direct clone of any social platforms, but it's definitely similar to Myspace or old Facebook in different ways, at least in my opinion.
I've met a few people on there, they seem cool. The site is definitely small, but everything is a lot easier to customize.
By all means, feel free to ignore this completely if you have no intentions of looking at other sites. I like being on several of them though, so Spacehey and Ribbit are definitely my first choices.
Overall, they're both great sites.