Plenty of clients will ask you to write these as part of your article writing assignments for them but if you don't see the importance of writing them well, you are selling your clients short as well as taking a wee little bit away from your presentation skills when you hand in finished work.
What makes a great meta tag? A great meta tag tells people in twenty or so words why they should click on your link. It should tell them what they will find. If that tag or description convinces them that they will find the information they want by clicking your link, they will click it.
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Happy Writing :)