Wikipedia
The best idea is to buy or borrow a good biography.
My opinion:Zefron.com(offical fan site) ;)
You can find quizes and more about zac efron at http://zac-e-rox.webs.com
Zac Efron's un-official Website Is www.zefron.com This was the first site dedicated to Zac Efron (2005). He doesn't sponsor the site, but Efron and his family have provided authoritative information for the site, and he has met with the site sponsors.
http://www.zac-efron.us/ is a great site that is very up to date with adding pictures and information about what he has been up to recently! Also Just Jared Junior (JJJ) is good to keep an eye on Zac Efron as well All else fails try wikipedia.org http://justjaredjr.buzznet.com/tags/zac-efron/
Zac Efron's web-site is www.zefron.comThis is a fan site, the oldest and best; Efron is aware of it and has assisted it from time to time, but he does not own or sponsor this or any other website.
Google Kristen Stewart wikipedia. It will provide a biography and any other info you need
One can find the detailed biography of Derek Jeter in the following sites; Derek Jeter biography on bio True Story site, Derek Jeter on mlb.mlb site, and Derek Jeter Biography on JockBio site.
He does not have any networking site accounts.
To find more information on Zac Efron and Ashley Tisdale, one can become a member of their fanclub, which will include a package with all their information. As well, one can also go to IMDb or Wikipedia and look up the celebrities' information from that site.
It is possible to find out why Tito Jackson is famous by looking on his own site or any site that has the biography of Michael Jackson. This is because he was one of the Jackson 5.
wikipedia.org