Through Plethos, a group can launch its own customized crowdsourcing campaign, in order to procure annotations (tagging, color tagging, geo-location tagging) from the public, regarding digital cultural collections that the group has selected. Each campaign has a specified timespan and a desired annotation goal. Plethos also provides information and statistics about each campaign, like its percentage-based progress depending on the set annotation goal, the total count of the users that have contributed, along with a map pinpointing their locations, and finally a leaderboard consisted of the most active users.