This ties in with the shift towards spending less time on the internet and quickly moving to real world interactions.
For example, instead of spending time sifting through profiles looking for a vegetarian partner, all one has to do is sign up with a vegetation niche dating site.
Visual appeal is an important factor in human attraction whether off or online.
When users browse for potential dates, they first look at pictures to see if they can find any they like before focusing on anything else.
For the first few years of online dating and chat rooms, the main focus was merely on the ability of single people to search out other singles.