i’ll respond with pictures in case i'm not the best at explaining (sorry 😭) but they are both apps.
Social Maker allows you to make instagram, twitter, and facebook posts & messages. - this is what i use for creating messages & group chats

Social Dummy is similar but includes a lot more features like as snapchat, netflix, lockscreen, tumbler etc. - i rarely use this since it’s a little more difficult to use (in my opinion)