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FYI: Opensite explorer (mozbar) is reading the PA wrong for Twitter pages. Unless my personal twitter page has a Domain Auth of 98 So don't pay too much attention to the PA score on Twitter pages plus it's no follow any way. To answer the "not showing in site explorer" question, for a start OSE does not crawl every page on the web, it does a good job of trying but SEOmoz don't have the horse power of Google. The more links you have pointing at your Twitter page the more likely Roger will pick it up, but I really would not worry about it. Also remember that the SEOmoz index only gets updated once a month, so if your page is new that might be why it's not showing yet... Hope that helps