Upon retirement, what was your number one source for reemployment (network of peers, social media sights, career fairs, hiring events)?

Social Media (LinkedIn), and job search pages were my primary source.

Peers

My wife was still active-duty when I retired. We PCS'd twice and I had to job hunt twice. Both times I got hired from companies I found at job fairs. In fact, from the second job fair, I had multiple interview opportunities.