What’s wrong with my twitter?

From last night,I found that twitter.com has been down(As shown above),then i thought it might be soon restored.However when I opened twitter.com again,it was still down

How would the world famous site  down for so long time?”Twitter is over capacity.Please wait a moment and try again”was shown on the homepage of twitter.com. Then I press F5 on my keyboard for much times and I failed again and again.

Suddenly ,I thought of a twitter api site ,”tuite.im”. That’s great! I connected with after 24 hours!But my doubt is: why I can login Twitter via api site instead of the  main site?

Finally,I go back to twitter.com again to find its status,it says:”Twitter Help Center Temporarily Down 16 hours ago”and”Users Cannot Update Profiles 19 hours ago”. It can be concluded that Twitter has much trouble recently,but this conclusion can not answer my doubts~

Did you face the same problem like me these days?What’s wrong with my twitter?