Given a particular Twitter profile, that contains tens of thousands of tweets, what is the best approach for:a) downloading the text (with date) of all tweetsand/orb) search for a specific word in all tweets
Search for a specific word in all tweets for a given Twitter account
twitter;search
If you want to search for a specific word (which, I believe, is what you meant by 'work') you can use Twitter's Advanced Search. I've attached a screenshot which includes fields both for Words and for People where you can specify the word(s) and the account(s) you want to search through.You can also see the related question: How do I search within someone's tweets?