A "finsta" is a fake Instagram. A lot of teenagers and college students have been making second Instagram accounts to post pictures of them doing things that they would not normally post on the internet. I, personally, think that in most cases people are just finding another way to hide behind the internet. I am sorry if this offends anyone who has made one of these accounts, but I really hope this will make you consider a few things.
You realize people can still connect your "finsta" to your name, right? They can also see your profile picture so they can see who is really behind the fake account. This really is a weak attempt to hide behind the internet and even post inappropriate things. I do not get the point of posting a picture on one account and not the other. You might make the account private, but that only does so much.
The biggest problem though, is that if you feel that you cannot post a picture on your Instagram, why is it acceptable to post it on this fake account? If you are worried about posting it, I would take that into account. Especially if it is really inappropriate, just remember that it can be connected back to you even if your full name is not on the account.
The point of this article is just to remind people to be careful. I promise you aren't that cool if you are posting a ton of pictures of you drinking or smoking. If you are too afraid to put it on your regular Instagram account, maybe you shouldn't do it at all.