Hi,
Not sure if this relates to http://ellislab.com/forums/viewthread/166147/P36/, but I’ve found that, using the twitter_timeline plugin with create_links, the hashtags are not generated correctly.
Twitter uses http://twitter.com/search?q=%23hashtag
while twitter_timeline generates http://twitter.com/search?q=#hashtag which will redirect to the userpage of “hashtag” in stead of searching for “hashtag”.
Modified the plugin (around line 160 in both EE1 as EE2 plugin versions 1.3.1 and 1.4.1) to not use %23 in the code but %23 (”%” is the html-entity for “%”).