With every twitter account I feel like squatting on (and, oh , btw, yes everyone does it), I create a not-too-close gmail account for use with just that twiter account (for verification), and use that to test the 3rd party apps that "Must" have your twitter creds in order to work. What I have found, by trial and eror, is that over half of ALL the currently available (and some beta) 3rd party apps work PERFECTLY WITHOUT any signup or twitter cred. So why do THOSE particular 3rd party apps need the info? I doubt they need it for future growth of the app or "extra features" later.