Logging an Experience
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It is important to keep in mind that your social media accounts are different from your résumé. Instead of bullet point information detailing each experience (work, volunteer, leadership, etc.), you want a summarized version that communicates the general contribution you made. This is actually easier than developing a résumé description because you can take your résumé highlights and represent those in one or two sentences. When you do have a full-time position, more space can be dedicated to detailing that position for recruiters to see.
Here is a resource for more information on writing a LinkedIn job description.