This morning, a group of journalists and activists held a press conference to raise awareness of what they see as a frightening trend: police, in the run-up to the Republican National Convention, increasingly targeting journalists. I’ll have video of the conference later today, but here’s a quick video on Vlad Teichberg, a member of the Glass Bead Collective, a New York new-media art group. He and two colleagues were detained by Minneapolis police this week without charge and searched. Police confiscated notes, computers and videocameras, exposing the film in one camera and finally returning the equipment days later. He says we’re at a cultural tipping point: With so many citizens toting cameras to events like RNC protests, police have little choice but to follow strict police protocols — or else run the risk of being outed on YouTube.