You have gone through all the hard work, so there is no excuse for not following up unless you have taken another job offer. Even so, it’s common courtesy to keep each other informed. At the end of the day, nobody likes being left hanging.
Make sure you have the contact information of people you met and spoke to including an email address, full name and job title.
After your phone interview or face to face meeting, send an individual simple email to each person you encounter within 24 hours – preferably on the same day. It helps them to reinforce their memory about you.
From experience, most people often get pretty upset and aggravated when their name is constantly misspelled. Simply check on LinkedIn or call up the receptionist to double check when you are in doubt.
It may take a couple of days to process your application after the job interview; if you still don’t hear from the hiring manager or recruiter, you should always send a follow up email or give them a call emphasising your continuing interest.
Don’t be afraid of following up: it shows you are genuinely interested in the position and it’s your right to check the status of the process as long as the communication does not go overboard.