I totally disagree.
Why would this be technology reliant?
If you have contact with Civ A, the next time you meet Civ A, why is it so difficult to say:
"hey, I've got another Civ, say, Civ B, that I'd like you to meet that you haven't met yet, but it will cost you XXX"
Do you need fission research for that?
You simply have Civ A's send contact through YOU to Civ B's contact that YOU speak with. Simple. Does that require rocket science? Frankly, I think that's the most least techno-intensive thing I can think of. Remember forget about boats, crossing oceans, etc - it doesn't matter if one of the parties is in the stone ages - as long as he has contact to YOU and the third party does as well - then YOU can act as a liaison. Period.
This rewards Civs that have expanded rapidly - or at least give you the option to trade this as an asset.