been having that problem for a few weeks now (only at night as i suspect a lot of people are online) give it a min or 2 as hornet said and refresh it again. What is annoying about it is when you have just typed a huge message then when you hit the send button you get the server is busy notice, that means you have to rewrite the message and hope the server isn't full when you re send..
not with me, just keep hitting refresh, when it comes good your message will be sent