Twitter Rules!

Sugree Phatanapheromsugree@gmail.com

http://sugree.com/

Twitter

Social messaging service 140 characters

Follow friends Notification – gtalk, sms Open APIs My twitter – http://twitter.com/sugree Clients – Twitterific, TwitterFox, Snitter, Spaz,

Tweetr, TinyTwitter, Jitter

Behind Twitter

Ruby on Rails Mongrel cluster Starling MemCache Master/slave MySQL Erlang ejabberd

Stability?

Twitter is stable as long as there is no big event, e.g., MacWorld 2008

In other words, it is scalability issue!

Scale of Twitter

Assumption #1 10,000 users 1 update/hour = 3 req/sec 3 minutes refresh interval = 55 req/s

Assumption #2 100,000 users 1 update/hour = 27 req/sec 3 minutes refresh interval = 555 req/s

BitTorrent Tracker

Assumption #1 10,000 users 30 minutes announce interval = 8 req/s

Assumption #2 100,000 users 30 minutes announce interval = 83 req/s

Fact Apr 2007

http://www.slideshare.net/al3x/scaling-twitter-railsconf-2007

200-300 req/s Spike at 800 req/s Peak at 11,000 req/s 2,400 queries/s

Fact Apr 2007

Mongrels 19 cores Message queue 16 cores Jabber 2 cores MySQL 8 cores (single box) 16+ GB MemCache 32 cores total

Why Twitter?

E-mail Leave messages in mailbox Wait for read/reply or Call/SMS/IM to notify

IM Wait for online

Twitter Tweet to IM, to SMS and/or to e-mail

IRC and Twitter

Per channel broadcast

Join/part/kick/ban Direct message On-line only

Web IM Client

Broadcast Follow

+on/_/off/unfollow Direct message Always on-line

Web IM SMS APIs

What are actually in Twitter?

What are your friends doing? Thoughts Questions Answers Opinions etc...

Fun to

Follow friends Ask and reply on the road Get reply promptly Track words

How to Twitter

Go to http://twitter.com/ Sign up Bind your gtalk and twitter@twitter.com Bind your phone

Charge rate depends on your career True Move – receive free / send 9 baht

Add-on services

http://twitterfeed.com/ http://www.loudtwitter.com/ http://twitternotes.com/ http://twittercal.com/ http://twittervision.com/

Clients

AIR – Spaz, Snitter, Tweetr Firefox – Tweetbar, TwitterFox Gnome – gTwitter J2ME – TinyTwitter, Jitter iPhone – Thincloud, Hahlo Binding – Python, Ruby, PHP

Wanna try?

The best way to understand the power of Twitter is to give it a try

Bind gtalk And ”follow sugree”