Some more observations:
I get an error message when I try to like other people's comments, and it does not update to give them a like. I was able to give one person a "like" and then it would not let me like any more comments after that. I assume this is a glitch, but it should probably get fixed.
I tried to make some changes to my profile and preferences via the "settings" option (found in the drop down menu when I click on my name in the upper right corner). I can make changes... but then there is literally no save changes button. I looked all around the screen, I asked my partner to look and he couldn't find one either. I tried just going to a different tab, and it told me my changes were not saved. It asked me if I wanted to go back and save them. The only options were "go back" and "discard changes". I clicked "go back" so I could save my changes, but there still was no save changes button anywhere. I tried many times, I finally gave up and left the settings page without being able to save the changes I wanted to save. If there really is a way to save changes we make to our settings profile and preferences, please make it way more obvious and easy to find.
I would also like to add my voice to those who have commented that having the default sort method be "by most liked" rather than chronological really does feel like a popularity contest is considered more important than having a flowing conversation. In my experience, when posts are set to be sorted by popularity, it becomes extremely hard to follow what is actually being talked about, it makes some people look way more important than others, and it often degrades into people just trying to get lots of "likes" or upvotes by performing to a crowd rather than having thoughtful and considerate discussions. Having this type of popularity sorting method set as the default sets the wrong kind of atmosphere. I think it can still be an option, but I don't think it should be the default option.