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[LEVEL ONE]

is the text not appropriate for them?

Exactly. Have you looked at those links? Those memes can only have a very specific type of content.

Guide:
- Socially awkward penguin must contain a socially awkward situation.
- Grumpy grandpa (Back in my day) must begin with "Back in my day"
- I dont want to live on this planet anymore must say "I dont want to live on this planet anymore". This meme is usually attached to another thing that makes you lose faith in humanity
- "Afraid to Ask" Andy must end with "And at this point Im too afraid to ask"
- The Baby Godfather must say something mafia-like but must still be in reference to baby things
- The Unpopular Opinion Puffin must of course contain an unpopular opinion

And they all must of course be funny (except the "I dont want to live on this planet" and "The Unpopular Opinion Puffin")

It is hard to make a guide on how to properly do those types of memes, just go to http://9gag.com/meme and you will figure it out soon enough.