If you don't feel comfortable posting it, don't. There are lots of questions that are available in the bio block. Only answer those you wish to answer. And only with the answers you are comfortable giving. And you don't have to be all-inclusive, either. If you want to just give a few things when you have a list of 547 favorites, that is ok.

Put things in there that don't change much. If you are bad at updating, like me, fill in your bio with things that don't change often. That way, less necessity to update. Instead of needing to do it often to keep things correct, you can add something clever in when you think of it.

Don't forget the picture. I think my favorite part of other people's bio blocks is the picture. For me, it doesn't even have to be a picture of you. I think the pictures add a nice little bit to show some personality. They are fun! You don't have to be in them, but your picture can still show something about you.

Don't forget to set some recommended items. Whether they be yours or a friend's, show new visitors to your portfolio some of your favorite stories or groups.