My personal opinion: I think the idea of a website helping an unsold/unoptioned writer to connect to people in the industry is a fantasy.
I have had a few aspiring writers contact me over the years after they read my script samples online (I'd set up an
index page for my own use, to help me keep track of what I was working on, and accessible from anywhere... handy for copy/pasting loglines into query emails, too). I've stayed in contact with some of those writers and regularly swap news and tips. And, an aspiring director did make a
feature movie from one of my scripts after he read a sample online as a result of a web search, which was jolly nice of him.
But these are rare occurrences, so rare in fact that I've let my website account lapse, the pages should fade away over time (sometimes they display, sometimes an error says "not found" but then they display OK next time).
Don't let my opinion or experience influence you. I think maybe it's one of those "Well, it can't
hurt to post samples/loglines/synopses online, can it?" things. Use the Force to guide you.
-Derek