No you require either Facebook or Twitter.
How do you talk without a Mouth...
Change the pfp on your browser.
Without any doubt,Twitter
no because you don't have a twitter account yourself
This will be due to your privacy settings. On Twitter, you can prevent anyone seeing your profile by "protecting your tweets". This means you have to approve anyone who wishes to follow you.
Yes, you can play "It Girl" game without a Facebook account.
Yes
you twitter your yahoo untill u google
You don't need a Facebook Account to get a Skype Account!
you can not
no sorry u have to have an account
Without clarifying what "wiki" you are joining, it is not clear whether or not you need a Facebook account to do so. For example, you do not need a Facebook account to become a member of Wikipedia. However, you need a Facebook account to join WikiAnswers.