YEESSSsSSsssss.........
This site is 100% free to join.
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"Why are people joining?" is a asking a question. "Why people are joining" would be an answer to that question. As in Why are people joining the free speech movement? Why people are joining the free speech movement is because they fee that they do not have free speech at the moment.
Joining WikiAnswers? Well, to join WikiAnswers, it is free!
yes
yes
No, Answers.com is absolutely free.
Yes it is. Yes it is.
Yes
Joining Blurb is free, there is a charge for printing photobooks using their service.
Joining Twitter is free, using Twitter is free.
You can't. The only way to interact with another player if by joining the site :)