Ravelry is like wikipedia and Facebook combined into one site for knitters and crocheters. There are all kinds of groups to chat in, a member maintained database of patterns and yarns, and a personal profile where you can log your yarn, projects and more. This site has everything, and if it is missing something you want, you can add it! It's a great way to promote your knitting or crochet related blog, business, etsy shop, patterns for sale, etc.
