OhMyGov! reports that, although Twitter does not require its users to register as male or female, that analyzing tweets can be revealing:
. . . there are certain “buzzwords” that can often be found by analyzing the output of female tweeters. Phrases such as “chocolate” and “shopping” are among the most repeated for women tweeters. The most popular phrases for men, you ask? “Http” and “Google”…hey we never said either gender was more interesting than the other.
In other news, they found a nest of twittering twits.