Hey there, to help you guys out, here a few links that I use to make fake tweets and fake instagram posts. It's pretty easy, takes a little bit of nuance and work but I think they come out looking great.
When you go to make a new social media post for your character, please just make a new thread here on the board and post the image in the thread. I've allowed for people to reply so if you want to turn it into a back and forth, feel free to do that as well.