I subscribe to the scene. When anyone leaves a comment, or if the scene gets edited, I get an alert at the top of the page that says "New Messages". All that only works if you do not use the Algodoo built-in browser which is very limited. Just use a standard browser like FireFox or Edge. Go directly to Algobox and sign-in with your username and password. You will be much happier than when you used that Algodoo browser.
Okay, I proved that a comment can be edited on a mobile. I made my original comment with just the word TEST. I wrote the comment using my Windows desktop computer. Then I edited the text on my mobile phone by adding the five X's to the word TEST. My phone is a standard Android cell phone.
Yup, there are a few different versions of this paradox floating around the Internet, and mathematicians have been discussing them for a very long time. I love this stuff!