Like Buttons in Joomla Articles

May be we have some placeholder like {FBShare, TwitterShare etc}

I'm not sure what you mean by this. Are you seeing those tags already on the site? If so, that means that the JFBCSystem plugin is not replacing those tags properly. That can be caused by a few reasons:
* The JFBCSystem plugin is executing *before* Flexicontent is rendering it's output. Try ordering the JFBCSystem plugin last.
* Disable caching of Flexicontent or your whole site (temporarily) to see if that fixes the issue. If so, it means the output is being cached before the JFBCSystem plugin replaces those tags.

If I'm wrong and you aren't seeing those tags, then:
* Yes, you can add them manually to your article content or a Flexicontent template file so that the buttons show.
* If you want to use the Content plugin, there may be a setting in Flexicontent to enable Joomla Content plugins. I haven't used Flexicontent in quite a while though, so don't know exactly how it executes content plugins.
* Can you verify that the social buttons work on normal Joomla articles? That will help verify a lot of the functionality in JFBConnect is working properly to render the buttons and we'll just have to narrow down what's different about Flexicontent.

Thanks,
Alex

And there is no ANY information about that in Component settings and in Plugin settings!!!!!

In the JFBConnect Administrator area, for in each Provider section, there is a "Examples" tab which lists out all of the tags you can use for each provider along with examples and details of every parameter available. There are a lot of tags available. Hopefully that helps you find them in the future.

How I can edit the styles of those buttons? They looks outdated.

We use Facebook's own buttons to display. You can use the Facebook Configuration tool below to configure and see what Facebook offers for display. If you see a display option that we don't support, let us know and we'll make sure to add it:
developers.facebook.com/docs/plugins/like-button/

And what about other social networks? They are not displays.
But I enabled them in component settings.

Can you let us know a URL where we can see the buttons? We'll gladly take a look and let you know what we find.

Thanks,
Alex