I agree completely random is not good. I meant random in the sense that there is not a set agenda and you are meeting them for the first time. But yes, there has to be some context. In these meetings I have done 100% of the people have been in tech.
Dig the post. The title is definitely a good way to get some clicks. But I would disagree that your first 3 examples are "stupid" things to say. They at least have some basis and are absolutely great challenging statements that can lead to awesome discussions.
Awesome post, just did a pretend Hackathon with a friend of mine and it turned out great! Deadlines and structure really force you to work efficiently and to prioritize.
Information and search is usually easier and more comprehensive on the original site. With that said, there has to be a good reason for me to visit an aggregation service to view that information. For me this site doesn't do it for me. All your doing for me (in the housing category) is plotting Airbnb & 9Flats on a map, which since there are only 2 sites doesn't add a ton of value for me. I would rather go directly to Airbnb to find potential housing because more owner information and more powerful search options.
Again, I think aggregation adds true value to consumers when you save them from visiting 10+ websites, but not from 2 or 3.