Tech commentator Niall Kennedy interviews his 19 college-going sister Sinead about her use of Facebook. Great interview. Real insight. Perfect use of the podcast format.

• Sinead reveals how social sites are all about photos and keeping the parents out.

• She's set her privacy settings 'pretty intense' on Facebook and has absolutely blocked her Mom. Yet she seems pretty certain her Mom has still been able to see the photos she least wants her to see.

( Niall K. used to podcast along with Om Malik. But he popped up on my radar because he occasionally catches the occasional stray tweet from Maryrose Lyons that was actually intended for me. How's that for digital overhearing? )