This list was published on the HubSpot company blog.
The First Sin: No picture
As LinkedIn itself states, profiles with pictures are many times more likely to be clicked on by users. A professional picture is an absolute must.
The Second Sin: No summary
LinkedIn gives you the opportunity to summarize your personality, strengths and expertise. If you don't use this opportunity, you are making it clear you aren't aware of any expert knowledge that you could provide to others.
The Third Sin: Use of the third person
You are the author of your own profile, everybody knows that. Here, the LinkedIn profile is different, for instance, from a bio entry at a conference, because writing in the third person isn't an option here.
The Fourth Sin: No contact information
Not every user has the possibility to write you a message through LinkedIn without being connected. This is why it is necessary to at least give your e-mail in your profile.
The Fifth Sin: Overpacked list of connections
LinkedIn is a professional, not social network. Don't be in connection with people just because you know them from school. Your connections should be relevant. It's about quality, not quantity.
The Sixth Sin: Grammatical errors
Misspellings on your profile can be a red alert to many users as a possible proof of your inattention to detail.
The Seventh Sin: No recommendations
Use the opportunity to note recommendations by your former employers, colleagues or business partners. In the end, this is what most people are interested in.
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