Stemgeeks is just an interface and I then guess they choose tags to display but unless you post through their interface to the Hive chain I don't think you are eligible for their curation. It is like the Leo finance votes they only assign tokens to posts made using their interface.
RE: Image Transmission on Wireless Visual Sensor Networking Devices Imote2 Platform Based on IEEE 802.15.4 ZigBee Embedded Linux 2