Write @theblockchang and today's date on a piece of paper and hold it next to your face. This is what all new members should be doing on steemit as it prevents hackers from pretending they are a bunch of people, and just generally lends credibility to your account and work.
You certainly don't have to. But one example - I was looking on here the other day and found an #introduceyourself from someone claiming they are an Australian who just graduated law school with a perfect score - but their English and grammar was awful. They had posted a photo as well, but it's probably just stolen from facebook... We are starting to see a lot of that here....