You can post whatever you like Agree! but:
It should be original and not copied content (if you have to share a post with many social media, post on steemit before sharing if not, bots will detect and mark your steemit post as a copied post)
Use the correct tags that relates to your post if not it may be downvoted or flagged. I got on this post through the cryptocurrency tag but I can see very little or (no info as i consider) about cryptocurrency
RE: steemit is the best social network.