Hi
What’s the best /recommanded method for sharing an alloy blog post with Facebook & tweeter ?
Alloy does not integrate directly with social media sites like Facebook and Twitter. While Alloy has meta data for these services when sharing to them, Alloy does not access their APIs to post to those services. This is not something Alloy is likely to take on in the future. The APIs for services like those change far too often and would lead to breaking the integration when they decide to change their APIs.
Best approach? After you make a new post to your blog, go to your post, copy the URL and then go to Twitter or Facebook and write your social media post and paste the link to your blog post. 
Clear explanations Adam. Thank you