Later I added the question about what if it was easy to find a good job?
For a long long time thereafter I assumed that users would have to answer some kind of questionnaire, as they do in dating services like eHarmony today. Then I considered that large scale services and social media like Google and especially Facebook could gather this information automatically. As the recent abuse of Facebook data by Cambridge Analytica shows, this is all too possible. To me this had some potential for use instead of user questionnaires, but apparently not. Facebook will indeed suggest people you should contact or become friends with, but these are always friends of your friends, not people from distant parts of the social network which are actually compatible with you.
There is no reason whatsoever to think that you are compatible with the friends of your friends. On the other hand, there are undoubtedly many compatible people who are not even friends of friends of friends.
What is new, however, is the method of Recursive Exhaustion, through which Very Large Scale Data Collection is easy and automatic. Briefly, a large amount of information can be collected on almost everybody without their active participation or knowledge.
This has great potential for good, and great potential for evil. One the one hand the large amount of information collected about you can immediately be used to find you a good spouse or lover, a good friend, or a good job. On the the other hand, your privacy will have gone out the window, making you susceptible to blackmail or intimidation.