Our Travel Stackexchange twitter account - @stacktravel tweets out questions with the used tags on the questions.
Some of the tags we use are not very common on twitter, especially among the travel writers / tweeters.
It makes so much sense to add #travel onto each tweet, if there's space, that it'd get seen a lot more. (I'd almost suggest other event ones like #ttot and #tni but that's sort of hijacking their convos ;))
However, #travel would get a lot more of these travel questions seen.
Also: note that you can see the historical stats of this account by checking twittercounter.com.