Quick question about the twitter librabry

Hey I am doing some research on using the twitter library. I have written a code for a home security system and I want it to send me sms texts via twitter whenever my alarm goes off, or if my alarm is activated/deactivated. I have shortly come to realize that twitter will not allow to sending the same messages over and over. I was wondering if anyone has found a way around this. I thought of using a random number generator or even easier, a increment on the messages that way they are different every time. Only problem is I don’t know how to do this in the code. Can you give me any advice? I also thought about using the timer library that way it would send the message along with date and time but for some reason the library won’t compile correctly. Not even the sample codes will work. Anyway I’m just trying to test this out using the simplepost that comes with the twitter library before I implement it into my security system code. I guess I basically need to know how I can make the messages different every time they are sent so twitter won’t block them. Here is my code so far:

#include <SPI.h> // needed in Arduino 0019 or later
#include <Ethernet.h>
#include <Twitter.h>

// The includion of EthernetDNS is not needed in Arduino IDE 1.0 or later.
// Please uncomment below in Arduino IDE 0022 or earlier.
//#include <EthernetDNS.h>


// Ethernet Shield Settings
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0xD7, 0xA7 };

// Your Token to Tweet (get it from http://arduino-tweet.appspot.com/)
Twitter twitter("My Token");

// Message to post
char msg1[] = "Hello, World! I'm a the arduino";
char msg2[] = "Blue On";
char msg3[] = "Blue Light Off";

int blueLED = 15 ;

void setup()
{
  delay(1000);
  Ethernet.begin(mac);
  // or you can use DHCP for autoomatic IP address configuration.
  // Ethernet.begin(mac);
  Serial.begin(9600);
  
  Serial.println("connecting ...");
  if (twitter.post(msg1)) {
    // Specify &Serial to output received response to Serial.
    // If no output is required, you can just omit the argument, e.g.
    // int status = twitter.wait();
    int status = twitter.wait();
    if (status == 200) {
      Serial.println("OK.");
    } else {
      Serial.print("failed : code ");
      Serial.println(status);
    }
  } else {
    Serial.println("connection failed.");
  }
  pinMode (blueLED, OUTPUT);
}

void loop(){
delay (118000);
digitalWrite (blueLED, HIGH);
delay (1000);
twitter.post(msg2);
delay (120000);
digitalWrite (blueLED, LOW);
delay (1000);
twitter.post(msg3);
delay (2000);
}