People are more contraversial, because there is no fear of physical backlash. People are prone to bend the truth, as there is little to no way to verify if they are telling lies or not. And people tend to eavesdrop more, as is common in most public chats. So, needless to say, one must be very careful in creating an approach to minister to those in chat rooms. It helps to be accountable to another believer in the same chat room.
Temptation affects everyone, even the strongest believer.
Please don't let this stop you from going solo if you feel led to, or if the opportunity arises - Encourage other christians to 'come out of the closet' . Oftentimes, even in a sinful chat room theme, you will discover there are christians in the wings who attend church regularly and claim to be born again. Curiosity draws them in, and peer pressure keeps them quiet. Keep Jesus the main theme, and ask them to help witness for Christ. Almost every chat room has some joker who thinks he's being cool by constantly chanting Satanic verses, cursing rampantly, condemming God, and asking for sexual favors.