Are myspace, youtube, here, piczo, facebook and wikipedia good for 11 year olds?

im 11 and i want YOUR opinions on each of these, not "hell no" or "delete all your accounts now"

http://www.piczo.com/hughwilliams12?cr=5...

http://www.myspace.com/hughwilliams12

http://www.youtube.com/user/Willhu12

http://www.youtube.com/profile?user=otte...

http://www.facebook.com/profile.php?id=5...

Are myspace, youtube, here, piczo, facebook and wikipedia good for 11 year olds?

I can give you some other sites to visit.

http://www.ebaumsworld.com

http://www.oddtodd.com

http://www.zefrank.com

http://www.geeksugar.com

http://www.funnyjunk.com/

http://www.funnyhub.com

http://www.evilmilk.com

http://www.lotsofjokes.com

http://www.seventeen.com

http://www.stardoll.com

http://www.dressupgames.com

http://www.cartoondollemporium.com

http://www.dressyourmodel.com

http://www.deviantart.com

http://www.zedge.net

http://www.preteenplanet.com

http://www.weeworld.com

http://www.cokemusic.com

http://www.imvu.com

http://www.runescape.com

http://www.chatzy.com

http://www.amusingfacts.com

http://www.discovery.com