Notice (2018-05-24): bugzilla.xamarin.com is now in
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See parameter names in .NET at http://msdn.microsoft.com/en-us/library/ms145162%28v=vs.110%29.aspx
See parameter names in mono at https://github.com/mono/mono/blob/master/mcs/class/System/System.Net.Sockets/Socket.cs
.NET has byte buffer, int offset, int size, SocketFlags socketFlags, out SocketError errorCode
mono has byte  buf, int offset, int size, SocketFlags flags, out SocketError error
The buffer, socketFlags, and errorCode parameter names are incorrect in mono. This affects all overloads of Send() that have those parameters.
Parameter names must be the same for code that passes parameters by name to compile on both platforms, eg:
s.Send(buffer: new byte, offset: 0, size: 128, socketFlags: SocketFlags.None);
Fixed in master