How i can hide this thing?

alzander wrote: The social toolbar only shows to Super Admins that are logged in, and not any other users. In the 6.1 release, there will be an option to completely hide the bar.

Until the 6.1 release, to completely disable, please edit the /components/com_jfbconnect/libraries/toolbar.php file.
Around line 17, you'll see:

public function onAfterDispatch() 
    { 
        if (JFactory::getUser()->authorise('jfbconnect.channels.post', 'com_jfbconnect')) 
        {

Update that by changing the if statement to 'false' like below:

    public function onAfterDispatch() 
    { 
        if (false) 
        {

Do the same for the onAfterReturn function at line 44.

I hope that helps, but if you have any other questions, just let me know.

Thanks,
Alex