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No matter in what field you work, nowadays an internet identity is indispensable.

First, start by creating a LinkedIn account.  http://www.linkedin.com
LinkedIn has over 60 million members in almost every country in the world.  This is the most important resource for professionals to build contacts.
You can join groups and thus find people in your field.  You can also recommend other people and get recommended.  LinkedIn offers many other functionalities such as resume databases, job listings, and file sharing.

Once you created your LinkedIn profile, you should start a blog or a website.  I suggest you use the very reliable WordPress.com.  This is a free tool that allows you to have your own domain and does not display any ads.  I recommend that you create a domain using your full name, such as sylviasmith.wordpress.com.  You should use your WordPress blog to write articles about topics in your field.  Make sure you use tags for your posts so that search engines such as Google can find you more easily.

Finally, you should take the last and easiest step which is to create a Twitter account.  Make sure, just like with your WordPress.com domain, to create a user name consisting of your first and last names.  Your Twitter page will then be http://twitter.com/sylviasmith.  Twitter is a microblogging tool.  You can write a microblog or very short post containing up to 140 characters.  You can find people to follow at http://listorious.com.  You should start by following as many experts in your filed as you can.  You can only read tweets at the beginning and then start retweeting.  When you feel confident with Twitter etiquette, you should start tweeting.  Be aware that unlike Facebooks, your tweets are plublic, and anyone could read them.

A last tip, leave traces!  When you are online, remember to leave as many traces as you can. Make sure that these traces portray you accurately and professionally. For instance, try to participate in forums, write reviews and comments, and post answers (in Yahoo Answers for instance). People performing searches on you, will find the content you posted and learn about your involvement and knowledge.

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