In your own space, promote three communities, challenges, blogs, pages, Twitters, Tumblrs or platforms and explain why you love them.
hd_writers - I love this comm for the cheerleading and encouragement that it provides. They have weekly writing sprints in a chatroom to help encourage you not to get distracted by all the tabs in your browser whilst writing. Have to admit I've fallen off the wagon, but hoping to start participating in them again. Oh, and they have a Friending Meme going on right now!
little_details - A comm where writers can post research questions about something they are writing about and members in the comm who have knowledge about that topic (hopefully) respond back. I've never actually posted a question there, but I find the broad range of topics fascinating (What would a kindergarten classroom in East Germany in the 1960s have been like, or how would someone emigrate to Australia in the 1930s, etc) Today's gem that I need to dive in to more closely - a website that maps all (nearly all) the bombs that fell in London during WWII -
http://bombsight.org/#10/51.4724/-0.1009)
Pinterest - Never saw the need to join Pinterest, but
Posy Roberts shared her tip of creating Pinterest boards for the books she is writing. She creates visual story-boards for the photographs of people who resemble her characters, for the places that are featured in the stories, etc. I tried it out for my NaNoWriMo novel that I wrote in November, and really liked it. When stuck for words to describe things, it is so easy to go to the boards and be inspired.