public List<MentionList> GetMentions(string format, string apiToken, string apiTokenSecret)
{
SinaApiService myApi = new SinaApiService();
string myResult = myApi.mentions(format, consumerKey, consumerKeySecret, apiToken, apiTokenSecret);
XDocument doc = XDocument.Parse(myResult);
return MentionList.Parse(doc.Root);
}