Here’s a simple database schema which can be used in cases where you want to take user status input. The entities available are users, updates, comments & likes. Additional entities can be added as required. Also, for simple user registration and status updates it will be more than enough.  Schema derived by studying popular social networks like Facebook / Twitter / Google+ Status Updates mechanism. The schema uses MySql.

Schema Diagram:

MySQL Create Script:
— phpMyAdmin SQL Dump
— version 3.2.0.1
— http://www.phpmyadmin.net
—
— Host: localhost
— Generation Time: Apr 03, 2013 at 09:56 PM
— Server version: 5.1.37
— PHP Version: 5.3.0
SET SQL_MODE=”NO_AUTO_VALUE_ON_ZERO”;

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
—
— Database: `updatebox`
—
— ——————————————————–
—
— Table structure for table `comments`
—
CREATE TABLE IF NOT EXISTS `comments` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `text` text CHARACTER SET utf8 NOT NULL,
  `created_at` int(11) NOT NULL,
  `update_id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
—
— Dumping data for table `comments`
—

— ——————————————————–
—
— Table structure for table `likes`
—
CREATE TABLE IF NOT EXISTS `likes` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `update_id` int(11) NOT NULL,
  `created_at` int(11) NOT NULL,
  `dislike_user_id` int(11) DEFAULT NULL,
  `like_user_id` int(11) DEFAULT NULL,
  `comment_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
—
— Dumping data for table `likes`
—

— ——————————————————–
—
— Table structure for table `updates`
—
CREATE TABLE IF NOT EXISTS `updates` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `text` text CHARACTER SET utf8 NOT NULL,
  `picture` varchar(255) DEFAULT NULL,
  `location` varchar(255) DEFAULT NULL,
  `created _at` int(11) NOT NULL,
  `video` varchar(255) DEFAULT NULL,
  `tags` varchar(255) DEFAULT NULL,
  `user_id` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
—
— Dumping data for table `updates`
—

— ——————————————————–
—
— Table structure for table `users`
—
CREATE TABLE IF NOT EXISTS `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `first_name` varchar(255) NOT NULL,
  `mid_name` varchar(255) DEFAULT NULL,
  `last_name` varchar(255) NOT NULL,
  `username` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  `email` varchar(255) NOT NULL,
  `address` varchar(255) NOT NULL,
  `phone` varchar(255) NOT NULL,
  `dob` int(11) NOT NULL,
  `about` text NOT NULL,
  `user_type` int(11) NOT NULL,
  `created_at` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
—
— Dumping data for table `users`
—

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;