I was on writing.com a few years back when it was still stories.com.
It can be very addictive. I met some wonderful people there and learned a lot about writing for the internet, but there were some trolls who would give bad ratings just because they didn't like a person and some of them would even go give bad ratings to the friends of the person they didn't like. That's what made me close my account.
Of course I posted some fairly controversial pieces and was not very internet savvy. Stories.com was my first "home on the internet".
If you run across Tornado Day, could you remember me to her? Same handle as here.
She taught me how to maximize a window when I was struggling with the library computers and wondering how anyone could actually LIKE the internet.
I also tried not to get too caught up in accumulating Gift Points and sponsoring my items (except for on the Shameless Plug Page) because I didn't find it all that helpful; I got a lot more hits because my items were more visible, but the people were not as interested in what they were reading and tended to read just the one item and miss the context. The reviews were much more helpful when they came from people who were familiar with my work and read it because they wanted to. It was also easier for the second kind of reviewer to point out the areas where I needed improvement.