You do know that maybe 20, 10, or even less than 1% of the people who Buffer'd it actually visited your site and downloaded the app, right? Most people use their suggestions on auto-pilot. I would be excited if you saw people spontaneously praising it on Twitter, not Buffering it. When i search on Twitter, I only see the automated Buffers, not tweets like "Just found out this app.. love it!" or "Has anyone else used…
I know conversions are only a small percentage. Some people are excited and I still receive emails from people. Eyeballs first, conversions second right? My page visits have been growing, and Twitter is a percentage of it.
It's something to build on. My honest take is that people are interested in the idea, but I need to continue working on the product. Execution is important.