I have multiple accounts on Youtube since I don't think people who subscribe to my Mxproject Asian Music Forum's Youtube channel will not be interested in my Computer help video Youtube channel.
Plus, I have one YouTube account for personal use for subscribing to video makers I like.
I sometimes need to make more then one account on forums when I forgot the password on a forum, and their password reset/recovery does not work.
I'm thinking about making an extra facebook account for promoting my forums, websites, and blogs.
On YouTube (though I don't have videos on either account, lol!) and Twitter, I have multiple accounts for personal use and for two forums I administrate. That way, my updates aren't mixed between business and personal. As for Facebook, I just use FB Pages for the other accounts and have a standard account for my own use. If I were you, I'd use fan pages for your sites since they don't have a 5000-person limit and people can see things without you having to accept requests.
I sometimes make regular accounts to test if members with less then 5 posts can't post links, and to see if there are any problems registrating on my forum after I upgraded the forum software.
I have multiple E-mails,too since I don't feel like using my cartoon sounding e-mails like ninjaturtleboy, thegamerzone, froggyboy604, etc to e-mail family members, and other people I know in real life.
