Interesting idea, though it seems like I've seen several services like this appear and apparently not go anywhere. How are you going to achieve critical mass?

Some feedback:

1. "Our knowledge is the cheapest thing to us" seems way off; my knowledge is the most expensive hard-won thing I have. That doesn't mean I don't want to share it, but "cheap" implies low value and seems like the wrong word.

2. The focus on coffee is a bit strange. I don't drink coffee, or meet for "coffee" or anything.

3. The three characters after "Matching" in the animated demo just show up as missing-character boxes for me (Android Chrome).

4. I can't tell if it's audio-only on Android. If you included a shared whiteboard that would make many things, e.g. maths, art, etc. way more doable, especially with picture/screenshot import.

5. The quotation marks in the quote bubbles are all over the place. The two that have them are both inconsistent and incorrect. I think you don't need them, but if you want them, in English they should be “...” and look like 66...99.