Ravelry
"Ravelry is a community site, an organizational tool, and a yarn & pattern database for knitters and crocheters."
I can't say it any better myself. It's free to join and essential if you want to take part in the knitting and crochething world online. There are also innumerable groups you can join to find exactly those people you share interests with.
Etsy
"Etsy is a marketplace where people around the world connect, both online and offline, to make, sell and buy unique goods."
I use Etsy a lot. This is where indie crafters can share and sell their unique items. This is where I buy all my dyed fiber, home goods like tea towels, and unique gifts for my friends and family. I love creative people, and want to support them the best way I can; by buying their products.
WritingForums
This is the biggest and most active writing forum I've found for writing interested people. They have a nice setup of rules for when you can receive criticism on your work, and you need to be active in order to take advantage of this. I enjoy that, it forces people to give before they get. It also creates a way more alive community, which is the whole point of a forum. If you're interested in writing you should check this forum out,
