There's now a character limit on the introduction field.
In the most recent development cycle we've introduced a 300 character limit to the intro field when writing a post.
If your intro is too long and you try to press publish or save you'll be shown a little red message inside the intro box that looks like this;
If you're thinking about going to edit an old post but worry that the existing intro is too long, don't worry - this update will only impact new posts.
We hope this update will be helpful for you, and will encourage some more pithy and succinct introductions. If you have any questions please drop me a line firstname.lastname@example.org