On cam I merely have it in my topic that I have solo and girl-girl videos. I have over 700 videos, so describing/promoting them all would be a bit of a challenge. I have thought of putting graphics on my SM profile for certain frequent requested videos, but I tend to do alright simply finding out what the member would like to see and sending it after they tip.
I took a mini-break from promoting on social sites for a while (last month a wiring issue in my apartment made camming impossible, so I was doing all clips all the time). Normally, however I try to upload and promote at least one vanilla clip, one fetish, and one specifically femdom throughout the week with links to my clip stores. I also try to do MP4's first, and upload WMV format throughout my camshift.