I have seen, enough times to notice, people writing in Facebook comments ‘Here, here’ instead of ‘Hear, hear’ and ‘Awe’ instead of ‘Aw’ (or ‘Aww’ or ‘Awww’ etc). These are homophones – they sound the same when spoken.
‘Hear, hear!’ began in the British Parliament as ‘Hear him, hear him!’ – an imperative to other members to pay attention to what the speaker (the main speaker, not the person saying ‘Hear, hear’) was saying. Now, on Facebook, there is no element of ‘hearing’, and ‘here’ is a more common word than ‘hear’. Also, someone can signal their agreement by saying or writing ‘Same here’. Intriguingly, Google Ngrams shows that ‘here here’ is more common than ‘hear hear’, but I can’t find any examples of it other than in internet forum comments or in discussions of ‘here here’ v ‘hear hear’. I also can’t think of any context in which ‘here here’ would even be possible.
‘Awe’ is a real word, while ‘aw’ is an interjection which can express ‘sentimental approval or commiseration’ or ‘disbelief, disgust or protest’ depending on the intonation’. It is possible that a Facebook commenter is expressing awe at a video of a dog and cat playing together, but I doubt it. I also wondered whether the most common spelling is ‘aw’ or ‘aww’ or ‘awww’ etc). Google Ngrams shows ‘Aw’ a long way ahead, and Dictionary.com has an entry for ‘aw’ but not for any of the other spellings.