[Plugin: WordPress.com Stats] missing referrers

Hello – I use bit.ly for url shortening within tweets regarding articles. I would expect wordpress stats to show bit.ly as a referrer but it doesn’t. Is this a bug? Bit.ly has stats that count number of clicks so I know traffic comes in from bit.ly. Please advise. The site is bit.ly url is http://bit.ly/OT3JA and it redirects to http://www.handyguyspodcast.com/tag/energy-savings

Thanks

http://wordpress.org/extend/plugins/stats/