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Examples of notable tweets the library cited Wednesday include the first-ever tweet from Twitter co-founder Jack Dorsey, the tweet on Barack Obama's account after he won the 2008 election and a pair of tweets from a photojournalist who was arrested in Egypt, then freed after a series of events stemming from his use of the micro-blogging site.

"And I think folks understand that whatever they post on Twitter is meant to be searchable. So I don't see a big issue here." Verdi said he would feel differently if the federal government seeks to identify users through their tweets or to match Twitter users with other information about citizens that is stored in federal databases.