Doppelganger is home to the original and official Ancestor Doppelganger Celebration that is held each year during the month of October in celebration of Family History Month. Participation can take place in Facebook or on your blog! The official rules are below:

In honor of family history month, Pastology would like you to dig through your family photos and find that ancestor that best resembles you! For the month of October you can change your profile picture in Facebook or blog about your Ancestor Doppelganger. While a doppelganger is usually someone who resembles you on the outside, Pastology is also allowing those ancestors who you might resemble on the inside. So regardless of the type of doppelganger you choose, here are the instructions:
1.For changing your Facebook profile photo
Change the photo and then copy and paste the following into your status: Changing my profile picture to celebrate Family History Month! Pastology asks....who's your Ancestor Doppelganger? The Ancestor I most resemble is....
2. To blog about your Ancestor Doppelganger devote one post to this event and then tell us about it by posting a link back to your blog on the event page or Pastology's fan page!
For those of you blogging about your Ancestor Doppelganger, we may choose some of the best ones to share link backs from the main Pastology site!