Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_3668 ( "#" real, "Title" text, "Timeslot" text, "Air date" text, "Viewers (000s)" real, "Weekly Rank Sky1" real, "Weekly Rank Virgin Media" real )

### Question ###
What was the weekly rank by Virgin media for the title aired on May 20, 2010?

### Accurate SQL ###

SELECT MIN("Weekly Rank Virgin Media") FROM table_3668 WHERE "Air date" = 'May 20, 2010'