Some people post on blogs, and others on forums. For instance, TrekBBS has a fanfiction forum where people can post their (mostly Star Trek) fanfic, and they have monthly contests.That is quite interesting, personally I really have no idea where to post my writing where people can and will read it, I tried to create my own website, but I could not find a format I liked so I just decided against it. I do not really know what a good place to post my writing would be or how to find it. This is only my second year I have been writing significant amounts of content.
You're welcome to post your writing here, as long as you don't have any words the autocensor would catch (Plotinus wouldn't allow a workaround when one of the Iron Pen writers wanted to use a particular phrase, so a different phrase had to be used).
There are other fanfic websites, namely fanfiction.net or Archive Of Our Own (AO3).
I've been thinking about setting something up myself, both for works-in-progress and finished works (to get around length and word usage restrictions). But that's a project that will have to wait a bit. I'm still involved in NaNoWriMo and I have a couple of Yahoo! groups that have content I need to rescue before it all gets zapped next month (hadn't realized that quite that much Fuzzy Knights stuff was uploaded there!).