Ask HN: Building a news filter app, any suggestions?

Hi everyone!

We're building a product called "News Filter". It will filter Hacker News, Designer News, Product Hunt and Dribbble in order to what users want.

We wonder if you have any ideas or suggestions about filters we can include. (e.g. if a post hits to homepage, specific user's posts with more than 50 comments, post title includes "Yo" etc.)

BTW, if you want to check the process out, please be our guest on http://newsfilter.co

Thanks in advance!