It's a project that allows anyone to receive real paper postcards from random places in the world. If you send a postcard from PostCrossing, you will receive one back from a random Postcrosser located somewhere across this giant world. A very fun social media network with great physical attribute!
KnowEm Members on Post Crossing are commonly tagged with:
Post Crossing Users
799 Users have profiles here
Social Media Relevance Rankings
Social Media Relevance Rankings describe how each site is performing relative to the roughly 600 social media networks KnowEm is currently tracking. A site with a score of 1 is in the lowest percentile for that metric, while a site with a score of 100 is in the highest.
For example, if the site has an Alexa relevance ranking of 10, that means it is ranked lower than 90% of the other social media networks. A site with a relevance rank of 90 is scoring higher than 90% of the others.