//---------------------------------------------------
// Filename: microblog.h
// Purpose: The header file for a class to store a single tweet
//---------------------------------------------------
#include <fstream>
#include <string>
#include "tweet.h"
using namespace std;
In addition to what Peter87 pointed out, you also may not have a const modifier on a constructor. What would be the point of the constructor if it can't initialize anything?
PLEASE USE CODE TAGS (the <> formatting button) when posting code.
It makes it easier to read your code and also easier to respond to your post. http://www.cplusplus.com/articles/jEywvCM9/