About a month ago (and after having a great exploratory discussion - thanks again for all the feedback!), I decided to make a comment required when sharing a link to Quibb. As many of you brought up in the comments, my expectation was that this would drive discussion, and help to add some context as to why a link was being shared. I assumed that this light amount of 'positive friction' would net out to provide a better experience overall.
(fyi - This is the opposite of what I hear from quibb members, requesting that posting links to quibb be even simpler - 'please let me cross-post links from twitter!', 'add quibb to buffer!', etc.)
After running for a few weeks, I looked at my dashboard - I was saddened to see that the needle wasn't moving in the direction that I hoped it would. The level of engagement around comments hasn't increased with the addition of the 'required comment' feature - however, the number of overall links shared has gone down. I then thought back to a few emails I received (randomly, all in the same week) from several Quibb members all along the lines of 'Wow, even as Quibb grows my digests are getting better and better!', 'I thought more members would only lead to more links I don't care about - but not at all!'. Perhaps more links shared overall leads to a more rigorous selection process for the daily digest, where more sifting occurs and only the very best content bubbles up into the digest.
So, as of late last night I reverted back to the previous posting flow - an initial comment is no longer required when you share a link to Quibb. This isn't to say that perhaps this feature won't come back in the future (I really do like it, in theory - as do many of you based on your feedback on the initial post), but for now it doesn't seem to have the positive impact that I was hoping for.