IANAL, but they are unlikely to hit anti-discrimination laws in many countries for anything outside a narrowly defined set of prohibited criteria for discrimination.
I think the biggest concern is that the social network effect creates a barrier to entry (it is hard to create a competing network with the same value to users as Facebook's because the value of people's existing networks outweighs the value of benefits like freer speech or a better user interface for most people).
Many governments regulate anti-competitive and monopolistic behaviour, with the aim of opening up competition in markets and allowing greater participation that way.
In this case however, Lamebook isn't really a competitor.
You will however trip a whole host of anti-trust laws in a number of countries. Europe, in particular, is usually pretty quick on the trigger with this.
I think the biggest concern is that the social network effect creates a barrier to entry (it is hard to create a competing network with the same value to users as Facebook's because the value of people's existing networks outweighs the value of benefits like freer speech or a better user interface for most people).
Many governments regulate anti-competitive and monopolistic behaviour, with the aim of opening up competition in markets and allowing greater participation that way.
In this case however, Lamebook isn't really a competitor.