Sarah E. Needleman published an accurate and timely article in the Wall Street Journal in July, which answered key logistical and style questions about how to best write and send thank you notes after a job interview, entitled, Thx for the IView! I Wud ♥ to Work 4 U!! 
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After a job interview:
1) Write a traditionally formatted thank you note. Make sure your grammar is correct and do not use slang or text-speak.
2) Send your thank you note via email promptly, but not so fast it appears as a throwaway text message comment. Be sure to identify why you are well suited for this position and how you will help the company.
3) Do not “friend” your interviewer on Facebook after the interview. You were interviewed for a job, not friendship. This would be much too forward, especially for interviewers over age 30.
Here are annotated examples of actual interview thank you notes that lost and won a position.
Read more tips on writing a thank you note from Leslie Harpold’s wonderful 6-step process, modified for business writers.
