To those who are part of the indieweb after spending a day trying to get my head around webmentions I have some questions.

• My understanding is that webmentions work only when both sites use webmentions, is this correct?
• How do you know if a website uses webmentions?
• If my website uses webmention and I write an article that links to an article on a website that also uses webmention, does it notify that website automatically or do I need to go back to original website and notify it.
• I am not a programmer, so if I want to set up webmention on a website is something like webmention.io the best way to set it up?
• How do webmentions work with social media sites like Twitter? I know I will think of more questions later, but that is all l have for now. Thanks in advance for any help.