There is no hard and fast rule on whether to use 1st or 3rd person on your LinkedIn Profile. While on your resume, 1st person is the standard, on LinkedIn, you have the flexibility to write in 1st or 3rd person as well as express excitement, passion, and personality.
The approach you use matters less than staying consistent throughout your profile. Write the same way in your summary as you do in your experience section. This can help keep your profile engaging throughout.
If you are having a hard time deciding what is best for you, read through multiple profiles of professionals in your industry. What sounds the best to you? Is there a style that is easier or harder to follow? This can help guide your decision.
For more information on writing a strong LinkedIn profile, review our Online Social Networking webpage as well as our LinkedIn Tips YouTube Playlist.