To create your own IM Bot you need to have some very basic programming skills. You can use any programming language, I prefer PHP. You also need to have web space to host your bot.

For example, I have created a Twitter Bot that can be used to tweet in your twitter account using any IM client.

If you like to write a personal IM bot, just follow these simple steps:

Step 1: Register at Imified

Step 2: Create your Bot which is just a simple script which resides on your webserver. It can be in any programming language.

Step 3: Copy the path of your script in the clipboard shown below.

Your Bot is ready to serve now.

The script I wrote is self-explanatory.
Just Add Tweetbot@bot.im in your IM client to try it.

//Twitter.PHP
require('TwitterAPI.php');

if($_REQUEST[('value'.($_REQUEST['step']-1))]=="reset")
{
	echo " start all over again now ";
}

else if($_REQUEST[('value'.($_REQUEST['step']-1))]=="?")
{
	echo " Hi, I am a Twitter Bot, you can tweet and see friend's timeline using me.
 type 'reset' to start again at any stage.";}

else{

	switch ($_REQUEST['step'])
			{
				case 1:
				echo "Enter Twitter UserName:";
				break;

				case 2:
				echo $_REQUEST['value1'];
				echo ",Enter Your Password, dont worry I dont store your password:";
				break;

				case 3:
				echo "Thankyou for submitting details
                                        Type 'tweet' to post a tweet and 'friend' to see friend's timeline";
				break;

				case 4:
				if (trim($_REQUEST['value3']," ")=="tweet")
				{
					echo "Enter Message to tweet";
				}

				else if($_REQUEST['value3']=="friend")
				{
					echo "I am working on this function, will publish it soon";
				}
				else
				{
					echo "enter correct choice ";
				}
				break;

				case 5:
				$result=tweet($_REQUEST['value1'], $_REQUEST['value2'], $_REQUEST['value4']);
				echo $result;
				}

}

No, This is not the only code you require. We need to use Twitter API as well, I have put that code in a seprate file.
You can make a number of Applications using different Open APIs

//TwitterAPI.php
function tweet($username,$password,$message)
{

// The twitter API address
$url = 'http://twitter.com/statuses/update.xml'; 

// Set up and execute the curl process
$curl_handle = curl_init();
curl_setopt($curl_handle, CURLOPT_URL, "$url");
curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl_handle, CURLOPT_POST, 1);
curl_setopt($curl_handle, CURLOPT_POSTFIELDS, "status=$message");
curl_setopt($curl_handle, CURLOPT_USERPWD, "$username:$password"); 

$resultArray = curl_getinfo($curl_handle);

    curl_close($curl_handle);

    if($resultArray['http_code'] == "200")
		{
    $result="Yipee, Check your profile ";
		}
	else
		{
		 $result="Error , Username or Password is not correct ";
		}
	return $result;
}

Learn How To Use Imified API
Happy Coding!