How important is it to get a twitter username to match your domain name? I have a domain available I would like to buy however the twitter username is already taken (bill.tld is available, but twitter user "bill" is taken). What are your thoughts, do any of you have twitter usernames that don't match your site name and do you feel it is okay? If I bought bill.tld should I do twitter user "billofficial" or some variation of that? Or should I just try for a different domain name that has all social media usernames available? 
Thanks.
Thanks.