people don't have issues with anonymous, people have issues with ppl who talk bs. People tend to be more honest and talk less s**t when they put their name and face on social medias....
Write a cover letter saying that you are staying at your friend place. If your friend got a rental contract then it'd be great if you can include that in the documentation. easy peasy
Well, you don't have to explain that to me but to the supervisor. All those thai visa pages are full of users who claimed to be interviewed in thai, some mentioned that they got questioned at the immigration at the airport as well. There was a huge crackdown on ED visas which has become a major red flag. If you can speak and read the basic then you don't have to worry, if you used the ED visa to live in thailand long term then that could lead u to troubles