An interesting website does this thing.Go to http://twitterscore.net/high-scores-by-location (Related links) and click on the Country you want to explore!
The number of specific Twitter users per country or nationality is unknown.
America.
You can search for specific users on Twitter. Then, once you have an account and you are signed in, you can click on the "follow" button on their profile.
http://twitter.com/search/users?q=peter+krause&category=people&source=find_on_twitter
Try to search which your Facebook, Twitter and linkedin friends using the instagram..you can follow them and invite to follow u..
13% of Americans use Twitter.
Yes there is a search box at the top (new Twitter) or at the right hand side (old Twitter)
You should search for her on Twitter.
Yes you are free to chat with other users on Twitter.
Just go to twitter.com or search twitter on a search engine (eg. google or bing) and click on the twitter link.
To search for people on Twitter, simply type a name into the search bar on the Twitter screen (using desktop version) or tap the magnifying glass (using smartphone app). The search will bring up users with the name you are searching, and also tweets that contain that name.
You can search for a hashtag without using twitter by typing the hashtag on Google.