lets talk write sites

So I've been to alot of sites, especially writing sites. Sites like Wattpad, Quizilla, and others like it. They all seem to offer different things. Wattpad seems more professional but alot less personal. Mibba has great organization and is really personal.

So here's my questions:
What do you guys like, love, and hate about websites?
What do you like about specific websites?
If you could add or change anything about any writing site, what would it be?
And is there any where you absolutly LOVE everything about them? (besides Mibba of course)
And, lastly, what do you prefer: personal or professional?

I'd love opinions and/or debates! Thanks!