I'm going to create an automated social bookmarker. Very likely it'll be a hosted web service that will just require a url, tags, title, description and will auto post them. Script will be hosted, but will be free to use for others to bookmark their stuff.
Only thing is I'm looking for a good list of social networks that are DoFollow but don't use captcha during the submission process. I already have a few, some are going to be a real challenge to do while others look really easy. I just wanted to get a good list of at least 25-30 before I start.
It's a bit of a recreational project, but I could see it being really handy when marketing landing pages, etc.