Yes they are. They kept in touch over the years. In 2009 they reunited for People's SBTB reunion. While Tiffani is shooting White Collar in NY, she said she would be seeing Mark Paul a lot more since he is starring in an off-broadway show.
http://www.tmz.com/2009/09/17/zack-morris-and-kelly-kapowski-back-together/
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No. They were at one point and recently (Feb, 2011) Jennie Garth was on a local radio station here in Boston. They asked her about Tiffany A T and she said they were no longer friends but she wouldn't elaborate on it. I can't believe I know this in detail!
Yes, they are friends. :)
They're best friends.
Yes, they're friends. According to Colin Ryan is one of his best friends.
Yes, Robert Vaughn and William Shatner were good friends.