Activists, particularly female and teen activists are at risk from people posing as other activists and who will get to know your details, where you live, what you do, where you go, when and who with.
This is usually because people are using FB as a campaigning and networking tool and are eager to spread campaign messages.
Disreputable people [for legal reason we will say these people are acting alone] who go on to Facebook "on behalf of the pharmaceutical industry" for example have in one known case [and this is still ongoing] made hundreds of Facebook and myspace profiles using other people's photos.
While law abiding people are unaware that their photos are being used, cyberstalkers are using the photos of such innocent and law abiding members of the public to spy upon, harrass, threaten stalk and abuse activists. One anti activists cyber stalker has made thousands of fake profiles and encouraged frineds to do the same. They have in some cases bombarded activists with messages, hate mail and misleading messages etc on campaign pages.
One activist has been the subject of a relentless and nasty cyberstalking attack that is part of a real life hate campaign. An office, house and car were broken into by the cyberstalkers who then sent messages detailing names and addresses of family members, home details and threats to "stop campaigning or else" which is all very nasty. This was re-itereated via hundreds of fake profiles. Some of the threats were sexaul and many violently threatening. Some of the threats were carried out.

As one can imagine...the police interest in this was negligable. Negligance in other words. Had an activist done something on this scale to an HLS worker it would be different.

While there might not be much we can do without becoming completely paranoid or being led to stop campaigning I think that there should be some kind of safeguard by FB to protect young people and women from this sort of thing...although it will probably just end up being used by the police against us.

If you are a parent [ESPECIALLY if you are the parent of a teen activist!!]- CHECK what young people are up to online...chances are you paid for the computer and it's installation, bills etc so...it's up to you!