This question has been asked many times before.

The answer is always the same.

Yes, Elgg can support infinite users, but is all depends op the underlying network structure you build it on.

Probably on a shared host you won't succeed, but if you have 10+ webservers and a database cluster there should be no problem.

Elgg supports multiple webservers, you can connect to a database cluster and if your dataroot (where all uploaded files end up) is on a network disk everything will work fine.

Yes you need to invest some time in maybe optimizing some stuff, but that has to happen with every product if you expect that many users.

Thanks so much

I have also set the permissions to 777 and still no success

I have also set the permissions to 777 and still no success

Never ever set permissions to 777 it's a major security risk. It opens up your server to be writeable from the internet.

I am getting a 403 forbidden error when I try to go to the link.

Does the error log say anything,

can you access for example README.md

403 forbidden error can be caused by lack of index.php file on the root site directory. Check to make sure you have index.php. If not, make a new file with a file name Index.php and paste the code bellow:

<?php
$autoload_path = __DIR__ . '/vendor/autoload.php';
$autoload_available = include_once($autoload_path);
if (!$autoload_available) {
    die("Couldn't include '$autoload_path'. Did you run `composer install`?");
}

return \Elgg\Application::index();

Are you seeing the PHP in your webbrowser? Then maybe PHP isn't installed/configured correcty.

If you only see the message 'Couldn't include '$autoload_path'. Did you run `composer install`?', then where did you get the installation files for Elgg. Here on the download page https://elgg.org/about/download or a direct download from GitHub?

Have a look at http://learn.elgg.org/en/stable/intro/install.html especially the troubleshooting part.

It looks like something is wrong with the files you copied. the index.php it trying to include a file /var/www/html/vendor/autoload.php which it can't find.

Elgg comes bundled with the Bookmarks plugin, is that what you're looking for?

...or like as Post Wall ?

@RvR Yes like post wall.Thats exactly what i need