Ok, everyone who is having trouble getting twitter to authorize a user. I believe there is a very high chance this is your problem, it solved my problem. My blog would send someone to twitter, ask them to allow authorization, then start the process all over again. Using wordpress MU, my blog is setup to be read at “politicalword.com” and even if I type http://www.politicalword.com, wordpress rewrites it to “politicalword.com”. In my twitter App settings on the twitter site, I had put the callback URL as “www.politicalword.com”, well since my installation was rewriting this to “politicalword.com” the plugin would not authorize any users, even when I clicked allow on twitter, nothing on the site would happen and the process would start over. So BE SURE your callback URL is set to the same URL you have set your blog to be read on. Even the www setting or no www setting affects this!