Let me begin by saying I am a *mature* 13 year old girl who is obsessed with books, celebrites from movies adapted from the books I love, and, um, IG. I have four accounts: the first, public, with over 1k followers, is my fandom account. On this account I post pictures from HP, THG, PJ, Divergent, etc. No selfies, not telling personal info, and I disabled geotags. Though I follow 2k+ people, I only follow accounts that are fandom based. Plus, I block and report anyone who follows me that seems even the slightest bit shady. The second, private, is my personal account. There I post selfies and random stuff from my life, allowing only people I know to follow me and following only people I know and a few select fandom accounts. The third, public, is a baking account. I post pictures I find of cakes; it's as simple as that- again, I block/report shady people. My fourth account, currently public, is a spare. I have it ready if I decide to make a new account.
Why I say it has good messages: many inspirational quotes are posted daily, as well as posts that encourage you to read different books.
Why I say it has language: Well, it does. Almost any words you can think of, BUT- any 10+ year old knows a majority of cuss words and not to say them. I read cuss words in books, see them on IG, hear them in movies, yet I don't cuss at all. There is little sexy or violent stuff, however, so no worries there!
HOW TO STAY SAFE AND APPROPRIATE:
Public account= no selfies, geotags, email, birthday, etc.
Private account= just don't put anything in your profile!
Always block suspicious people, and report those with too sexy content.
DO NOT post suggestive pictures, pictures with bad words, etc. This can lead to problems if people you DON'T want to see it (i.e. future employers, college administrators, principals...) If I see a pic I like with a bad word, I edit it out.
So, Instagram: It's AWESOME! Just use it right :)