Twitter has become an excellent tool for SEOs. SEO had a wrong name with many social sites. Places like myspace, Orkut and even social bookmarking sites like digg hates SEOs. But nowadays there are many SEOs who use twitter the right way.
They have learned methods to use sites like twitter with lot of respect. I have seen some very good discussions in twitter between people in search engine industry. Some SEOs have 1000s of followers which itself is a very good sign for SEOs.
People are listing to the SEO guys and I have seen people like matt cutts, Adam lasnik follow some SEO guys. Matt cutts makes some interesting comments in his twitter account which is worth the read when you are in search engine industry.
He already has a whooping http://twitter.com/MattCutts number of followers ( 45,000 ) .
Its incredible since there are so many people who are active in this search and SEO industry. Today the awareness of people about search engines is huge. Only good SEO companies and SEO guys survive in this ever increasing competitive industry.
Other people to look out for in twitter are Danny Sullivan, Jeremy Zawodny and lot more. I don’t recommend you block anyone who wants to follow you unless you feel they are really spammy. I have seen people having 100s of followers before seeing anyone spamming them.
Most SEOs feel twitter is a great neighbourhood. Even Pageoneresults ( Edward ) has named it twitterhood. Great to see SEOs use a great platform in a constructive way.