The safest way to go about answer this one would be to make a disclaimer for ourselves noting that our bias is influenced by the scope of our own social circle and behaviors.
So here's a window into mine.
If by playing the field you mean dating a lot of people at the same time, not telling them about it, and leading them all on into thinking there's exclusivity among everyone involved, yes, I believe that increased somewhat.
I recently removed myself from what I thought was an exclusive relationship when I discovered the girl I was with, who did the whole, "I'm falling for you, I can't wait to see you xoxoxo (insert unique nickname here)" sent that exact same message to 3 other people simultaneously. It tore me up inside, to say the least.
In the scope of online dating, the addiction to attention and ease of being anonymous almost guarantees that playing the field behavior will increase but it doesn't mean everyone will do it.