This is a subject near and dear to my heart as an Image Consultant. I am dazed and amazed at what people will post as a photo on any of the internet sites where a profile photo is required. New I know this whole area of profiles and profile pictures is probably new to some of you, but common sense should prevail. 
   First and foremost for men, photos of your bare chest (whether it buff, hairy or not) are not cool. Save it for someone that wants to see that. A photo of you dressed in a nice dress shirt (with just you in the photo) with a great smile looking into the camera would be far sexier.
  Women you too need to have a great photo and a current one at that. Don't post a photo of you from twenty years ago when you thought you looked the best. You want people to recognize you and know who you really are. You too should have a photo taken in a soft colored shirt or sweater (keep it simple no prints) looking at the camer smiling.
  Have a photo taken by a loved one every year to keep your profile pictures updated and looking like you.