Yes indeed.
One word of caution is advised, though.
When you type in a hashtag and a graph is displayed,
bear in mind that data for the last hour is incomplete.
So it will always appear that the hashtag has suddenly crashed, when in fact it's still trending.
Only use data for full hours to extrapolate the trend.
That's why I make my own graphs from hashtags.org data.
Pic related updated as of the hour ending 11 AM EST.