how do i know whats showing up in peoples news feed?

[abraXus]

facebook is a social networking site, which means your activities in public places are shared with all of your friends via the ticker

read this

http://abrax.us/Facebook/PrivateTicker.php

if you dont want that to happen, then make sure you only post in PRIVATE groups (not pages, not on other people's profiles, etc)

the only other way to prevent it is to add people you want to hide your activity from to your restricted list, but they wont see your status updates or anything either then, so there is no point in having them on your friends list in the first place then