If you have been on Instagram these pass few days, you probably come across a lot of posts pointing to the 3 dots in the top right corner telling and a message telling you to “turn on notifications”.
That function has been there forever. Brands and influencer are currently scared that an upcoming algorithm chance will make them less popular with their followers.
While this may be the case, popular things tend to rank better if you have looked at any other network. In fact the only people who the timeline change would possibly affect would be those with few likes (likely because their posts are unpopular or annoying).
Turning on notifications would just flood your already flooded phone with more pop ups. That’s something I don’t even do for people I like.
Tiana Feng 
Hey there! I wrote a pretty good article I think about what the changes actually mean and how it will really impact your IG feed :) go check it out if you like http://youngfitnfabulous.com/2016/03/29/calm-your-tits-what-is-really-going-on-with-instagram-and-the-new-algorithm/