Advantages of Instagram:
It increases the artistic ability by taking pictures at different scenerios.Communication will be improved.Friend lists get increased. Professional network also increases which is quiet helpfull.Can share information with friends/family in original way.
Disadvantages
Using incorrectly would leave bad impact on this feature.Sharing private information which should not be done on internet.Spending lot of time on it.Some use to spy on others even if they do not know them.
Protect yourself
The privacy terms allow to protect your photos from the unknown people. Rules keep changing so, one should always look at Privacy terms before signing to Instagram. You could also buy real Instagram followers.