I have a new gamer to Traveller right now that I have had this discussion with. They think that being a good or bad liar should be dictated by the Soc score. I told them they are making the mistake of assuming Soc is the D&D charisma of Traveller. I certainly do not see it that way as a ref. Typically, I'd use Int as the stat mod, but maybe Soc if its appropriate.
I always look at the situation and the Traveller/NPC skills. For the recon example above, I might go that route if its an interrogation scene or perhaps the person is covering up a crime. If you are having a conversation in a dive bar, and with a sketchy individual, its likely to be streetwise, opposite for a swanky cocktail party with well to dos where I'd call for carouse.
One of the things I love about Traveller is the skills can usually shape how a Traveller perceives, acts, and manages any particular scene/event. My current group has a couple of Travellers that connected over a diplomatic event. One is a solider the other an agent/noble. The noble gave the solider some high class customs experience, and the solider showed the noble the lower workings of the blue collar folk. Fun times.