Just breeze in there. People love when strangers interrupt their day without notice, and demand they drop everything and give them their time.

If you want to make a personal connection, that's what networking is for. The boss isn't the one who's going to get you in the door anyway – it's the human resources person, and they're more concerned that your résumé contains the right keywords.

Quit wasting your time on social media. Being fluent in social media is an asset in today's workplace. It many industries, it's a requirement.

Keep following up. No. Just, no. Well-meaning people have told you to call often or drop in to follow up on a résumé or interview, because they think it proves you're motivated and determined. Some advice-givers even suggest you're lazy or not trying hard enough if you fail to do this. In reality, you're making a total pest of yourself and drawing attention to yourself in a negative way.

You're not entitled to anyone's time.

Wear a suit. Sure, this still works in most professional settings. But if you show up overdressed for interviews in certain positions or industries, you're going to look like an out-of-touch dandy.