The whole subject of bacteria and it's importance in our health is so fascinating to me. I've recently started fermenting vegetables and making fermented tea (kombucha) in an effort to re-colonize my gut with helpful, good bacteria. I read an article that said that researchers have found that isolated tribes of indigenous people have many, many - like thousands - strains of bacteria in their gut. We Americans sometimes have as few as THREE. Which is why they hypothesize we are so susceptible to superbugs and autoimmune disorders. Our reliance on antibiotics in medicine and, unfortunately, our meat sources is creating a problem that will have disastrous results if we don't get smart about it.
So would I put bacteria on my face? Maybe not. But I would definitely consider ingesting it for improved health! And, by the way, it was all my research on pond bacteria that lead me to the subject of bacteria for better health. So, once again, ponding proves to be a healthy hobby!