There has been a trend recently of people posting Facebook links. I let it go when it was one or two, but really these should be removed according to the Reddit rules. The problem is that, in the past, people have taken it upon themselves to "teach" people they disagree with, which ended up as harassment.

Is posting personal information ok?

NO. Reddit is a pretty open and free speech place, but it is not ok to post someone's personal information, or post links to personal information. This includes links to public Facebook pages and screenshots of facebook pages with the names still legible. We all get outraged by the ignorant things people say and do online, but witch hunts and vigilantism hurt innocent people and certain individual information, including personal info found online is often false. Such posts or comments may be removed by moderators or admins. Repeated offenders may be banned. Posting professional links to contact a congressman or the CEO of some company is probably fine, but don't post anything inviting harassment, don't harass, and don't cheer on or vote up obvious vigilantism.

http://www.reddit.com/help/faq#Ispostingpersonalinformationok