public Tweet()
{
hashtag = Hashtag.Instance;
mention = Mention.Instance;
txtAbbreviation = TxtAbbreviation.Instance;
type = "tweet";
}
public Tweet(string id, string messageTxt, string sender)
{
hashtag = Hashtag.Instance;
mention = Mention.Instance;
type = "tweet";
this.messageTxt = messageTxt;
this.sender = sender;
this.id = id;
txtAbbreviation = TxtAbbreviation.Instance;
this.processAbbreviations();
this.processHashtags();
this.processMentions();
}