What are the random pictures on my instagram?

[Jessika]

okay so on my iphone, the instagram app has all these random pictures of other people that I dont know that are on the star looking screen- I was wondering if that was other instagram users and that means that somebody elses instagram might have my picture on there sometimes. If this is the case, is there a way I can make mine not be up there? Also, while I'm at it, I keep getting texts from friends with a lot of extra punctuation- i could.....get a text...,,,.that looks like...,,,...thissssss- is there any meaning to all of that? i would say the age range of these people is probably like 22-40 and I'm 27 myself so I was thinking it might be one of those things the whole world knows about except for me hahahaha.