No, I'm pretty sure you can have multiple accounts, if you want. If you check the You Know You're A WikiHolic If... list (see the Related Link below), one of the "symptoms" is, "You have created additional user names so that you can have multiple Watchlists."
Brands can have account on WikiAnswers. Anyone can have an account on WikiAnswers. You cannot use WikiAnswers for spam; it is to be used to only to answer questions for people or ask questions that people may want to know.
You cannot use the same email to register multiple Spotify accounts.
Each user has a username and password on Littlest Pet Shop Online. Because accounts can require payments, information on these accounts cannot be shared on WikiAnswers.
It doesn't. People answer multiple times every day. If you cannot answer more than one time you may have been blocked or are experiencing a glitch.
Jagex has posted on the website that having multiple accounts is fine, but they cannot be logged in at the same time.
WikiAnswers cannot predict the future.
WikiAnswers cannot tell the future.
No, in general people cannot find out your email if you ask or answer questions on WikiAnswers.com.
Wikianswers is a wiki, not a person and therefore cannot technically know anything. All answers provided are from people who use the site.
You cannot download WikiAnswers. WikiAnswers is only available through the internet, and nothing more. You cannot download the Wikianswers database, either.
Often they have been banned from games, and thus cannot make accounts from their own address. The downsides to making accounts for these people is that they will likely get banned again, causing you to get banned or locked from making new accounts.
No, you cannot.