Gemini is the sign which relates to information and communication. It is also the 3rd House of the natural zodiac. Jupiter being one of the outer planets, and a slow moving one, makes a real impact when it shifts signs since the movement is for 13 months and more.
Mithuna Rāśi is ruled by Budha/ Mercury and whenever Mercury comes to be associated with Jupiter in any manner, our trigger happy rationality gets direction and insight, all our social media and communications will be inspired by meaning and greater understanding. Our words shall have weight because Gurū in Saṅskṛt means heavy and there is unlikely to be any unbearable lightness of being insofar as communications and information-sharing are concerned.
The chart for the ingress of Jupiter into Gemini is given below-