3. The method as recited in claim 2 further comprising: monitoring said post with said recommended hashtag for changes to a sentiment, a trend and a propagation speed of said recommended hashtag; notifying said user regarding changes to said sentiment, said trend and said propagation speed of said recommend hashtag in response to changes in said sentiment, said trend and said propagation speed of said recommended hashtag; and recommending a new hashtag to replace said recommended hashtag to increase said propagation speed of said composed message and emphasize said sentiment of said composed message in response to changes in said sentiment, said trend and said propagation speed of said recommended hashtag.
2. The method as recited in claim 1 further comprising: posting said composed message with said recommended hashtag on said social network system.