The news feed makes it easier to discover photos on Instagram. It’s where you can see likes, comments and new followers for your account and other accounts you follow.
Your news feed helps you stay up-to-date on recent activity from people you're following. Tap 
and then Following at the top to see activity from people you follow. Tap News to see the most recent activity for you, including people who've started following you, @ mentions for you, and likes and comments on your photos. Note that the Following tab will not work for people who follow more than 1000 users.
Your activity on Instagram will be displayed in the Following feed for any user who follows you. If your account is set to private, only those users whom you've approved to follow you will see your activity.
Sometimes when tapping on the News tab, instead of seeing Instagram news and photos, you may see content from a website other than Instagram. This usually happens when you connect to the Internet on your phone via a "gated" WiFi network, such as at a hotel, airport, or cafe.
To fix the problem, delete Instagram and reinstall it. (Your photos and profile data will be saved on our servers when you delete the app, so nothing will change when you log back in to your account.)
Some users have reported that their News feed shows a login web page, or an error page. This usually happens when you have accessed the internet through a network that alters DNS settings; for example using Wi-Fi at a hotel, on an airplane, or at a coffee shop.
We're working on preventing this from occurring in the future, but until an update is available uninstalling then reinstalling Instagram resolves the issue. Note that uninstalling the application will not result in losing profile information or photos. In order to access your account, just log in after re-launching Instagram.
Liking Photos on Instagram
A "Like" is a way to give positive feedback or connect with things and people you care about on Instagram. You can like the photos that other Instagrammers post to let them know you like what they've shared.
If you’ve accidentally double-tapped to like, or unintentionally hit “❤ like” on your own photo, you can remove the like by re-tapping the “❤ liked” button just below the image.
Things to note:
Very soon after you remove a like, the like alert will disappear from the other user's news feed within the application.
Unfortunately, if you've accidentally liked a photo and then unliked it, the photo's owner will still receive a push notification if they have notifications turned on.
If you like, unlike, and then re-like a photo, the owner of that photo will only receive one news feed alert within the application for the latest like and one push notification for the initial like (that is, if the user has push notifications turned on).
For iOS devices, double-tapping to like and clicking on a hashtag/username are only supported for devices running iOS 4.0 or later. For Android devices, these features are supported on all devices.
You can search by hashtag or username by tapping the Profile tab > Search Instagram.
If you "like" a photo, then untap the "like" button but the heart icon does not turn from red to grey, it is likely that you are just seeing a cached version of the red "liked" heart icon. We cache certain images and text to make the application run faster, and occasionally this happens with the "like" icon.
Although the "like" button appears to be selected, no one else can see the like but you. It is a caching issue with the "like" button image, but the like has not registered in our system. Please verify the like is not registering in our system by viewing all of the photos you have liked and seeing if that image is listed (Profile > Profile Settings > Photos You've Liked)