Question: I need a database of interests for a coming project.
By saying "interests" I mean like:
Sports - Football, Basketball and so on...

Is somebody know something like this?
I just don't want start writing thousands (or even millions) of interests.

Answer: 
Try to google on "interests list" or "hobbies list" and the write simple parcer to extract all (based on neko-html for example). Examples of useful links: 

<http://www.notsoboringlife.com/list-of-hobbies/>

<http://www.buzzle.com/articles/list-types-of-hobbies/>

Also it is possible to ask admins of any dating sites to make a simple DB-query to get relevant result.
There is an API from google called Freebase. I allows you suggest to the user what input he should give the same way google search suggests you what to look for.

[Freebase](https://developers.google.com/freebase/v1/suggest)