Don’t tell me about your character

I’m drafting out some notes for a roleplaying post next week, and a thought occurred to me.

How many people are actually interested in reading backgrounds and stories about someone else’s character?

Do you read other people’s character backgrounds (in a game that lets you do that)?

What makes you more likely to read them? Length? How good the writing is? Whether you know the player personally? Or do you switch off the way you do when people start talking about their kids or their cats?