So recently i send my first invador, and he flew away. BUT, i noticed that the tech icon is still there on the map. So i opened tech manager. And here it is! I clicked "send to inventory" and all the blocks came back, while the tech dissapeared
It Tweets the tech you're sending and then other player's games (that are connected to Twitter) will pick up those tagged tweets and load the techs into their campaign game, randomly (as invaders). it's supposed to remove the tech you 'send' entirely from campaign, but the bug is apparently the new tech loader allows you to kind of resurrect it's blocks.
The incentive is purely that your design *might* show up in other people's games. If the Twitter system is working, etc, and the game deems your design suitable (not overly massive, etc).