Does twitter store all tweets?

Related questions

1. How can I find out who is looking at my twitter account?
2. How do you look up old tweets?
3. Can you see who blocked you on twitter?
4. Can anyone see your search history on twitter?
5. Does retweeting count as a tweet?
6. Can you see who visits your twitter?
7. How do I look at my twitter search history?
8. Can you secretly follow someone on Twitter?
9. Who recently viewed my twitter?
10. How do you find out what hashtags are trending on twitter?

Tags

1. #service
2. #allows
3. #twitter
4. #backup
5. #store
6. #active
7. #tweets
8. #access
9. #first
10. #already