Alert-based notifications... I will think about that for a while, I want to avoid subscription or another way of cashing information from user, which are also stored by 3rd parties sometimes (Google Chrome browser for obvious reasons). It should be easy to implement some client side function, which will erase itself, if user dont want to use cookies and still be able to work in those conditions. If user want to keep those data, it is up to him/her.

play the football 
travel  sports
 cooking
sports

Also thx for reply. Few hours ago I came back to improve responsive design, co cell phones should be ok with scaling of whole background - that was the bigest issue till now.

EDIT: even if numbers of users skyrockets, I would like to still keep it ad-free/tracking free