Is my iphone broken or virused?

Some tines my iPhone just crashes like returns to my home screen when i'm on fb or summin, wats wrong?

This is very typical! Either you got to many apps running or you may be running low on memory. Check the usage on your phone by going to settings general and usage. You can also double click the home button to end apps that you don't want to be running anymore. An iPhone can't get a virus. And it's not broken, it happens all the time.

The thing is if you have an old iPhone with the latest iOS possible, this happens. Or it might be for the memory or the usage of it. I had an iPhone Original (also knows as iPhone 2G) and it happened almost everytime.