Bios, in general, do not have a set word count because it varies depending on the media or platform used. A "micro bio," on the other hand, is generally two to three brief phrases, comparable to those in Twitter and website bylines, but a "short bio" may be 100 words or three to five short paragraphs. A typical short bio includes your name, age (if you know it), some identifying information (such as which high school you went to or which organization you work for), and a short description of your career path. Some biographers will also include an anecdote or two about their subject. The amount of space you have given over to your bio will vary based on the medium it is being read on. If you write well enough to be published, then it should be long enough to be interesting to readers. You also want to give yourself room to grow as a writer - don't cut things too close to the bone. The more you can say about your subject the better! With social networking, it is easy to publish a bio and never look at it again. So make sure that your bio highlights your important information and gets across who you are and what you stand for. It also helps if it is interesting - no one wants to read a boring bio! There are many ways to format a bio.