Indymedia is a news resource, and an important depository of information for the activist movement. What it is not is a space for publishing unsubstantiated rumours about activists. Please do not use it for such. Causing suspicion and distrust without solid factual basis for it only serves the State and corporations. Unsubstantiated allegations should be and will be deleted - it's not censorship, it is protecting people from malicious rumour- mongering. It is also well known that fascist, journalists, the state and private security firms constantly scour Indymedia and use it to post mis-information.
Northern Indymedia have recently finished developing a set of guidelines in what to do in relation to exposing some on the Northern Indymedia site. They can be found here: http://northern-indymedia.org/zines/1174
This project is still in progress, however, given that there is a lot of comment and scaremongering going on at the moment, it is worth having it in wider circulation.