BuddyPress.org

@petervandoorn see https://bbpress.trac.wordpress.org/ticket/2327

@marathifacebook,
Have a look at this, but it is for facebook only.

https://wordpress.org/extend/plugins/facebook-friends-inviter

@vijayalogiclab
I would give it some time especially if you are new but if you want to jump in to the deep end then study the codex:
https://codex.buddypress.org/developer/plugin-development/
Also See:
https://codex.buddypress.org/developer/plugin-development/creating-a-plugin/
If you don’t understand PHP and WordPress hooks then go through template files and look for do_action. Those are places you can hook into. First you need a file header for WP and BP to recognize it as a plugin, see the second link above. You then need to create a function. You will then add_action to where you need the plugin to execute in BP based on do_action which is the hook, and then you call your function. Here is a brief example:

<?php
/*
Plugin Name: My Plugin
Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
Description: A brief description of the Plugin.
Tags: buddypress
Version: The Plugin's Version Number, e.g.: 1.0
Author: Name Of The Plugin Author
Author URI: http://URI_Of_The_Plugin_Author
License: A "Slug" license name e.g. GPL2
*/

function my_plugin() {
 //Your Code Goes Here
}
add_action('bp_head', 'my_plugin');
?>

If this makes no sense what-so-ever then you need to spend more time on the codex and learning PHP because I doubt anyone has the time to give you a complete lesson and it will benefit you more by learning to crawl a bit before you walk.

Sorry I can browse the link you said

Not sure what you mean. The link I posted above leads to nowhere for you? It was a shortcut for http://bpsocialnetwork.wordpress.com/2012/07/13/complete-theme-wp-explorer/

Yes ! I install bp in my pc(localhost) … ! Nothing changed.

Unfortunately we don’t have access to the premium theme. BP auto Theme Compatibility works with almost all WP themes. Some do not work due to a variety of reasons including customized templating systems, erroneous coding, missing page titles in pages and so forth, all of which are beyond our control.

Have you checked in the forums of theme developer whether other Complete theme users are having this problem and what, if any, solution was provided by theme dev?

Free:
BuddyPress Album/Media -> https://wordpress.org/extend/plugins/bp-album/
BuddyPress Media -> https://wordpress.org/extend/plugins/buddypress-media/

Premium:
BP Gallery -> http://buddydev.com/plugins/bp-gallery/ u

I want to know this too.
Would be nice if there would be check marks in the WP User Admin to select which user meta would also appear in BP Profile.
Vice-versa, if custom profile fields made in BP could then appear in WP Admin.

This type of syncing seems necessary as WPSocialLogin populates useful info into the User WP Admin but there is no easy way to now get those WP User Admin fields into the BP Profile. (and I’m sure other plugin that are design to work with WP Admin don’t populate BP profiles). Seems like this “complete” syncing does not exist.

the number of members doesn’t really matter it’s the number of concurrent users that’s the issue. ning is a service so its hard to compare that to running something like wordpress or buddypress on your own server. There is a lot of functionality under the hood with buddypress if you want to run it and have a popular site you won’t find and commercially available shared hosting that will handle the traffic. 64 mbytes just isn’t enough memory to run buddypress reliably in my experience, especially when you start piling other plugins on top of it.

That being said you can buy a vps for probably about the same as that ning monthly fee. which should be able to scale you up to higher traffic levels.

You don’t really preface all that with a brief description of what is wrong!

Windows for starters is an issue with permalinks, you’ll need to read this for a better understanding:
https://codex.wordpress.org/Using_Permalinks

Although you say WP was/is working what permalink structure do you have? BP needs anything other than the default set.

The usual test please switch to a theme such as twentytwelve and see if issue persists also ensure some activity has taken place, add an update just to be certain the member is picked up on.

WordPress.org-approved BuddyPress themes

Is that a theme name then! helps to perhaps state an actual theme you’re using when this happens.

Custom post types, comments, and the activity stream in BP 1.5

https://buddypress.org/support/topic/display-custom-post-types-in-activity-feed/

Official BuddyPress dowload is here, and only here:
https://buddypress.trac.wordpress.org/browser/tags

Fixed in the https://buddypress.trac.wordpress.org/ticket/4982
Just replace the /buddypress/bp_blogs/bp-blogs-widgets.ph with this
https://buddypress.trac.wordpress.org/attachment/ticket/4982/bp-blogs-widgets.php