I had the same situation (I am in Beijing) and just now figured out the solution that works for me.
I am using a premium theme from Themolution and they included their own dashboard framework, and found out it includes a direct twitter widget connection linked to follow their twitter acount...
I tried hard coding the dashboard widgets away (also possible via WP Total Hacks plugin), but in the end the Twitter Update widget still stayed available, and it wasnt a plugin I installed, so I checked the html output which indicated that something wanted to follow themolution's twitter.
Inside their "theme-dashboard.php" they link to a twitter plugin they included in their "../themolution/assets/includes/widgets" folder.
I edited the theme-dashboard.php and now everything loads like a charm.
Keep in mind for me it was only loading twitter on the actual dashboard page, NOT on the plugin page and others..
Hope this helps a bit.