Until Tuesday afternoon, when Twitter released its first complete index, digging up old tweets - even from politicians, celebrities and other notables - was a surprisingly difficult task. Twitter's infamously glitchy search function could only go back so far in time. Google only indexes a small percentage of all tweets, and is biased in favour of top-tier accounts.
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So if you wanted to surface, say, those profane, insulting and otherwise unsavoury tweets that basketball's Kevin Durant sent circa 2009, you had two options: Navigate to Durant's timeline, put a weight on your keyboard's "down" arrow and hope to reach the bottom within your lifetime; or shell out thousands of dollars for an analytics service like Topsy (... which shuttered to the public a few months ago, anyway).
You couldn't jump to a particular month or year in a user's timeline, as you can on Facebook. And you certainly couldn't search a user's corpus of tweets.
In other words, even Durant's more offensive missives were pretty darn safe. Until now!