The “like” button indicates general approval. The blue thumbs up emoji is the “like” button. It’s used to generally show that you appreciated or enjoyed what someone posted. The like button is a little less emotional than the other Facebook emoji reactions, which tend to have subtext and more nuance depending on how they’re used.

The thumbs up emoji usually just means “OK.” The person you're texting is giving you their approval, so take it and leave it! Their ? is most likely a good sign and they are just agreeing with what you're saying. What does Big blue thumbs up mean on Facebook?