Most trend analysis is being published by someone who has some other agenda, and that skews the results.
Start with particular interest area(s) like fashion, online games, technology, etc. The main important point is that it is independent. It’s vetted and curated by experts in the field who are also vetted for no hidden agendas. This will give you a clear view of fads and trends.
No chair is precisely right for you unless it’s made for your body.
Build chairs made to measure from exclusive materials, and that conforms to your body and working habits.
So you can decide which one is more appropriate for a given situation, and to give an as complete a view as possible of popular terms.
Collect an exhaustive list of definitions of popular terms and publish online.
It would be interesting and educational.
A website that lists and explains current knowledge on all unsolved scientific problems and mysteries.
Using positive words helps your brain develop, while negative words increase your stress hormone (according to some research.)
An app running on your smartphone that listens to you and analyzes the words you use. When your use of negative words goes above a certain threshold you set, the app will alert you.