I know what you are all thinking. Hannah Baker is a slut. (3.151)
I've heard so many stories I don't know which one is the most popular. But I do know which is the least popular.
The truth. (3.212-13)
At first, Hannah's tapes seem like a way for her to clear her reputation, but in many of the later stories she makes some unpleasant confessions. This helps us see that Hannah isn't interested in people thinking she was some kind of angel. She wants to set the record straight by telling the truth as she sees it.
"And she was new to the school, so the rumors overshadowed everything else I knew about her." (3.218)
Clay suggests that rumors stuck to Hannah because she was the new kid. But Clay has known Skye since at least middle school, and he apparently believes rumors about her, too.