Answer:
Share as much as you can with your best friends.
Step-by-step explanation:
Positive Digital footprint is a term that simply defines as a positive reputation or impression an internet user leave behind online or other online users' positive perception of such user, often in an online discussion group or social media website in general. This includes positive content such as comments, posts, and shares posted by the users or tagged by other users.
Hence, to make a positive digital footprint, a user should "share as much as s/he can with his/her best friends." This will make such users leave a positive digital footprint because often than not, it is always happy moments and subjects such users will be sharing.