Facebook
Journalists can now link directly to interesting or newsworthy comments that are posted on Facebook. Each comment's timestamp now has a permalink you can copy and share. The system has some shortcomings; the page doesn't automatically scroll to the linked comment, and the comment is highlighted only for about a second before fading. But it's a start.

Related: A procrastinator's guide to Facebook brand pages changing to Timeline format on Thursday (Business Insider) | Trend stories about employers seeking Facebook passwords may be bogus (Hartford Courant) | Facebook IPO planned for May (Wall Street Journal).