I noticed that when I do a twitter post with a link back to my site, I have G bots and 3 or 4 other spiders instantly crawl my site. I since used it to get a few pages on my site that weren't indexed, indexed within a day. Would autoposting backlinks (maybe in short url form) be a nice method for site indexing and building link juice? I haven't done any larger studies yet. The main negative is the links are nofollow, but it still gives a burst of spider activity.