Twitter is now latest talk on the internet and search engine optimization. As much as top from the top companies you can contact on twitter. Following is the most desired list of the people from Google, Yahoo, etc.
Google & Google Product Blogs
• google / Google (main account)
• youtube / YouTube
• googleimages / Google Image Search
• googlereader / Google Reader
• googleapps / Google Apps
• blogger / Blogger
Google: Web Search
• mattcutts / Matt Cutts (head of web spam team)
• brianwhite / Brian White (program manager with web spam team)
• nathanjohns / Nathan Johns (search quality analyst)
• beahburger / Beah Burger (search quality evaluator)
• reidyokoyama / Reid Yokoyama (search quality team)
• wysz / Michael Wyszomierski (search quality team)
• pedrodias / Pedro Dias (search quality team)
• filiber / Fili (search quality)
Google: Webmaster Central
• googlewmc / Google Webmaster Central (main account)
• susanmoskwa / Susan Moskwa (Google Webmaster Central)
• peeyush / Peeyush Ranjan (Google Webmaster Central)
• thatadamguy / Adam Lasnik (webmaster relations)
• johnmu / John Mueller (webmaster relations)
Google: AdWords
• adwordshelper (main AdWords support account)
• adwordsprosarah (additional AdWords support account)
Google: More Twitters
• avinashkaushik / Avinash Kaushik (Google Analytics evangelist)
• cdibona / Chris DiBona (Open Source evangelist, among other titles)
• iamjason / Jason Morrison (Googler)
• jhuber / Jeff Huber (senior vice president, engineering)
• kraneland / David Krane (long-time Google PR maestro)
• larrybrilliant / Larry Brilliant (chief philanthropy evangelist, Google.org)
• mikeleotta / Mike Leotta (Google webmaster)
• rklau / Rick Klau (business product manager, Blogger)
• skamdar / Sagar Kamdar (product manager)
Microsoft: Live Search
• live_search / Live Search (main account)
• nathanbuggia / Nathan Buggia (Microsoft Webmaster Center)
• jandrick / Jeremiah Andrick (Microsoft Webmaster Center)
• ayazook / Aya Zook (Microsoft Live Search marketing)
• benmwatson / Ben Watson (Live Search software engineer)
Microsoft: adCenter
• adcenterblog / adCenter Blog (main Microsoft adCenter account)
• msadvertising / Microsoft Advertising Europe
• melcarson / Mel Carson (adCenter community relations)
Microsoft: Powerset & Other
• powerset / Powerset (main account)
• barneyp / Barney Pell (Powerset founder)
• jsenior / James Senior (Live services evangelist)
Yahoo & Yahoo Product Blogs
• yahoo / Yahoo (main Yahoo account)
• yahoogames / Yahoo Games
• yahoomovies / Yahoo Movies
Yahoo: Buzz
• yahoobuzz / Yahoo Buzz main account
• yahoosearchdata /Yahoo Search Data (interesting stats from Yahoo Buzz)
• meredfern / Joff Redfern (VP Yahoo Buzz)
Yahoo: Web Search
• searchmonkey / Yahoo Search Monkey main account
• cornett / Larry Cornett (vice president, Yahoo Search Product)
• crispierry / Cris Pierry (general manager, Yahoo Search)
• grahammudd / Graham Mudd (Yahoo Search Monkey & BOSS)
• jpederse / Jan Pedersen (Chief scientistt, Yahoo Search & Ad Tech Group)
• mwinters58 / Mike Winters (Yahoo Search team)
• rajgossain / Raj Gossain (vice president, Yahoo Search)
• sheila / Sheila Tran (Yahoo PR)
Yahoo: More Twitters
• adamzarlengo / Adam Zarlengo (product manager, Yahoo Movies)
• kylelaughlin / Kyle Laughlin (general manager, Yahoo Games)
• lauralippay / Laura Lippay (director of technical marketing)
• tonyadam / Tony Adam (SEO for Yahoo Audience Marketing)
• yahooguy / Gabe Elliott (search and display ad exec)
Ask
• askdotcom / Ask.com Europe
• keithhogan / Keith Hogan (vice president, technology)
Techmeme
• techmeme / Techmeme (main account)
• gaberivera / Gabe Rivera (founder, Techmeme)
• megan / Megan McCarthy (editor, Techmeme)
• twitter / Twitter (main account)
• ev / Evan Williams (CEO, Twitter & cofounder)
• biz / Biz Stone (Twitter cofounder)
Others
• craignewmark (Founder of Craigslist)
• kevinrose / Kevin Rose (Founder, Digg)
• skrenta / Rich Skrenta (CEO, Blekko)
• thegoldenhat (head of SEO for Facebook)