I resoundingly agree with everything mentioned above! And if we had these features, I could "like" those posts rather than cluttering the thread with a new post.
I would like to see the following implemented:
• "Liking" posts (and related notifications)
• Tagging forum members (by writing @username) (and related notifications)
• Embedding YouTube videos
• Embedding tweets
• Additional text options (superscript, subscript, strikethrough, horizontal rule, left/center/right alignment, etc.)