I'd like to see the first tweet of a twitter user. Is this possible without clicking "more" a hundred times?
Even clicking more won't necessarily get you what you want. Tweets disappear over time. For me it looks like everything prior to a year ago is gone.
First Sixteen Tweets (or as far back as it can go)
Tested it myself with the More button Here is how
Copy the link of the More Button and you are going to change the PAGE_NO to larger values until there are no more tweets (blank) then decrease the value/increase the value. Much Faster than clicking more.
The only other option is to follow the Library of Congress since they have have acquired all of the tweets since 2006 and see if/when they release it.