Hi! Thanks for the review and suggestions!
1 - The comments module is great, but has an important limitation: it is not possible to post comments to social networks. for instance, if a user is logged in wiht facebook, I would expect the user to be able to check an option near the post button to post to facebook. the same for tweeter... etc.
You mean, to post a comment on the post, AND on Facebook simultaneously? But if it goes to Facebook, to what, exactly, would the comment be attached to? Which Facebook post? I'm not entirely clear on what you mean, exactly.
2 - Also, the sharing buttons has a facebook button, but this button seems to be only a like button. Shouldnt we have also a button to post to facebook?
This is the case for the Official Facebook button, but if you use the Unnoficial buttons (Icons only, Text only, or Icon + Text), then it becomes what you describe.
3 - The post made by the comments button should be ajax in order to avoid a page load in each comment.
Thanks for the suggestion, I have opened a Github issue for it here:
4 - It would be nice to have widgets to put tweet and facebook feeds in the site (and set the pages where they should appear). I think the package doesnt have this.
What exactly do you mean by this? You mean, in the body of a post or page, rather than in a sidebar widget?
In each comment posted using a social network login, the plugin should put the social network icon near the post, so that would be easily to identify from where the user is.
That's not a bad idea, but the actual display of the comments is up to the themes themselves. We could potentially expose the origin of a comment (such as in the comment metadata somehow), which would allow themers to create special custom styles for it. I don't know how feasible this is, so I have created an issue for this here as well, to let the developers chime in: