The 21-year-old female college student on the receiving end of the Tweet that will live in infamy, tells her story in a statement to the New York Daily News:

Friday evening I logged onto Twitter to find that I had about a dozen new mentions in less than an hour, which is a rare occurrence. When I checked one of the posts that I had been tagged in I saw that it was a picture that had supposedly been tweeted to me by Congressman Anthony Weiner.
The account that these tweets were sent from was familiar to me; this person had harassed me many times after the Congressman followed me on Twitter a month or so ago. Since I had dealt with this person and his cohorts before I assumed that the tweet and the picture were their latest attempts at defaming the Congressman and harassing his supporters.
Annoyed, I responded with something along the lines of “are you f***ing kidding me?” and “I’ve never seen this. You people are sick.” I blocked their accounts, made my page private, and let the matter drop, expecting them to eventually do the same.
Within about an hour, however, I realized that I had grossly underestimated the severity of the situation that I had somehow become a part of.

More here, as well as here.