what does throw back thursday mean?

[Kayla]

what does throw back thursday mean? kids do it all the time on instagram! oh and how do you do the hashtags on instagram. the hash tag are in blue idk how to do that..

[Jazzi]

You just type the hashtag in your caption and write the whole word together. And throw back thursday means you post pictures that are old pictures; like for throw back thursday I put a picture of my 5th grade graduation