Getting more reactions and likes to the posts is what every Instagram user wants. 1 - use attention-grabbing hashtags, 2 - Tag the users you're expecting reactions from in, 3 - Write descriptions for your posts on the relevant topics, 4 - ...
TBH or "To Be Honest" is one of the most commonly used acronyms on the Internet. "TBH you’re a good man" or "TBH you are one of the most genuine people I’ve met".
So, TBH is an excellent example of how initialisms can grow and develop over time.