You may have read some of his posts in discussion groups, visited his website or you know one of his friends who recommended him.
3. Find something in common
Search for a common field of interest, common contacts, discussion groups, etc. You may also have your educational background or experience in common. Mention it in your invitation and write how you believe you can enrich each other.
4. Be enthusiast
If you are, for example, seeking employment and trying to connect with leaders of an interesting company, let them know that you like their company and that you would like to know more about it.
5. Refer to something in their profile
Before you send someone an invitation to connect, read his profile. Then mention something you find interesting in the profile in your invitation.
6. Thank in advance
Thank the person in advance for connecting with you. Also write about what you have to offer in your field that might be useful for him.
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Article source Careerealism.com - career and job search blog